diff --git a/nixos/modules/services/x11/gdk-pixbuf.nix b/nixos/modules/services/x11/gdk-pixbuf.nix
index 2dc8eabd95a7..9ad926369ec7 100644
--- a/nixos/modules/services/x11/gdk-pixbuf.nix
+++ b/nixos/modules/services/x11/gdk-pixbuf.nix
@@ -5,21 +5,21 @@ with lib;
 let
   cfg = config.services.xserver.gdk-pixbuf;
 
-  # Get packages to generate the cache for. We always include gdk_pixbuf.
-  effectivePackages = unique ([pkgs.gdk_pixbuf] ++ cfg.modulePackages);
+  # Get packages to generate the cache for. We always include gdk-pixbuf.
+  effectivePackages = unique ([pkgs.gdk-pixbuf] ++ cfg.modulePackages);
 
   # Generate the cache file by running gdk-pixbuf-query-loaders for each
   # package and concatenating the results.
   loadersCache = pkgs.runCommand "gdk-pixbuf-loaders.cache" { preferLocalBuild = true; } ''
     (
       for package in ${concatStringsSep " " effectivePackages}; do
-        module_dir="$package/${pkgs.gdk_pixbuf.moduleDir}"
+        module_dir="$package/${pkgs.gdk-pixbuf.moduleDir}"
         if [[ ! -d $module_dir ]]; then
           echo "Warning (services.xserver.gdk-pixbuf): missing module directory $module_dir" 1>&2
           continue
         fi
         GDK_PIXBUF_MODULEDIR="$module_dir" \
-          ${pkgs.gdk_pixbuf.dev}/bin/gdk-pixbuf-query-loaders
+          ${pkgs.gdk-pixbuf.dev}/bin/gdk-pixbuf-query-loaders
       done
     ) > "$out"
   '';
diff --git a/nixos/tests/gdk-pixbuf.nix b/nixos/tests/gdk-pixbuf.nix
index 005c5111da2b..9a62b593f46d 100644
--- a/nixos/tests/gdk-pixbuf.nix
+++ b/nixos/tests/gdk-pixbuf.nix
@@ -3,12 +3,12 @@ import ./make-test.nix ({ pkgs, ... }: {
   name = "gdk-pixbuf";
 
   meta = {
-    maintainers = pkgs.gdk_pixbuf.meta.maintainers;
+    maintainers = pkgs.gdk-pixbuf.meta.maintainers;
   };
 
   machine = { pkgs, ... }: {
     environment.systemPackages = with pkgs; [ gnome-desktop-testing ];
-    environment.variables.XDG_DATA_DIRS = [ "${pkgs.gdk_pixbuf.installedTests}/share" ];
+    environment.variables.XDG_DATA_DIRS = [ "${pkgs.gdk-pixbuf.installedTests}/share" ];
 
     # Tests allocate a lot of memory trying to exploit a CVE
     # but qemu-system-i386 has a 2047M memory limit
diff --git a/nixos/tests/ostree.nix b/nixos/tests/ostree.nix
index 8b19004874e7..d7ad84a1a5f0 100644
--- a/nixos/tests/ostree.nix
+++ b/nixos/tests/ostree.nix
@@ -12,7 +12,7 @@ import ./make-test.nix ({ pkgs, lib, ... }: {
       gnome-desktop-testing ostree gnupg (python3.withPackages (p: with p; [ pyyaml ]))
     ];
 
-    environment.variables.GI_TYPELIB_PATH = lib.makeSearchPath "lib/girepository-1.0" (with pkgs; [ gtk3 pango.out ostree gdk_pixbuf atk ]); # for GJS tests
+    environment.variables.GI_TYPELIB_PATH = lib.makeSearchPath "lib/girepository-1.0" (with pkgs; [ gtk3 pango.out ostree gdk-pixbuf atk ]); # for GJS tests
   };
 
   testScript = ''
diff --git a/pkgs/applications/altcoins/exodus/default.nix b/pkgs/applications/altcoins/exodus/default.nix
index 421f739a7a87..bc354a5213ea 100644
--- a/pkgs/applications/altcoins/exodus/default.nix
+++ b/pkgs/applications/altcoins/exodus/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchurl, unzip, glib, systemd, nss, nspr, gtk3-x11, gnome2,
-atk, cairo, gdk_pixbuf, xorg, xorg_sys_opengl, utillinux, alsaLib, dbus, at-spi2-atk,
+atk, cairo, gdk-pixbuf, xorg, xorg_sys_opengl, utillinux, alsaLib, dbus, at-spi2-atk,
 cups, vivaldi-ffmpeg-codecs, libpulseaudio }:
 
 stdenv.mkDerivation rec {
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
 			gnome2.pango
 			atk
 			cairo
-			gdk_pixbuf
+			gdk-pixbuf
 			xorg.libX11
 			xorg.libxcb
 			xorg.libXcomposite
diff --git a/pkgs/applications/altcoins/parity-ui/env.nix b/pkgs/applications/altcoins/parity-ui/env.nix
index 625a008af917..a878bbf2e3e3 100644
--- a/pkgs/applications/altcoins/parity-ui/env.nix
+++ b/pkgs/applications/altcoins/parity-ui/env.nix
@@ -1,11 +1,11 @@
 { stdenv, lib, zlib, glib, alsaLib, dbus, gtk2, atk, pango, freetype, fontconfig
-, libgnome-keyring3, gdk_pixbuf, cairo, cups, expat, libgpgerror, nspr
+, libgnome-keyring3, gdk-pixbuf, cairo, cups, expat, libgpgerror, nspr
 , nss, xorg, libcap, systemd, libnotify, libsecret, gnome2 }:
 
 let
   packages = [
     stdenv.cc.cc zlib glib dbus gtk2 atk pango freetype libgnome-keyring3
-    fontconfig gdk_pixbuf cairo cups expat libgpgerror alsaLib nspr nss
+    fontconfig gdk-pixbuf cairo cups expat libgpgerror alsaLib nspr nss
     xorg.libXrender xorg.libX11 xorg.libXext xorg.libXdamage xorg.libXtst
     xorg.libXcomposite xorg.libXi xorg.libXfixes xorg.libXrandr
     xorg.libXcursor xorg.libxkbfile xorg.libXScrnSaver libcap systemd libnotify
diff --git a/pkgs/applications/audio/amarok/default.nix b/pkgs/applications/audio/amarok/default.nix
index 855d31aadbb0..a4aa64280975 100644
--- a/pkgs/applications/audio/amarok/default.nix
+++ b/pkgs/applications/audio/amarok/default.nix
@@ -3,7 +3,7 @@
 , qca-qt5, qjson, qtquickcontrols2, qtscript, qtwebengine
 , karchive, kcmutils, kconfig, kdnssd, kguiaddons, kinit, kirigami2, knewstuff, knotifyconfig, ktexteditor, kwindowsystem
 , fftw, phonon, plasma-framework, threadweaver
-, curl, ffmpeg, gdk_pixbuf, libaio, libmtp, loudmouth, lzo, lz4, mysql57, pcre, snappy, taglib, taglib_extras
+, curl, ffmpeg, gdk-pixbuf, libaio, libmtp, loudmouth, lzo, lz4, mysql57, pcre, snappy, taglib, taglib_extras
 }:
 
 let
@@ -29,7 +29,7 @@ in mkDerivation {
     qca-qt5 qjson qtquickcontrols2 qtscript qtwebengine
     karchive kcmutils kconfig kdnssd kguiaddons kinit kirigami2 knewstuff knotifyconfig ktexteditor kwindowsystem
     phonon plasma-framework threadweaver
-    curl fftw ffmpeg gdk_pixbuf libaio libmtp loudmouth lz4 lzo mysql57.server mysql57.server.static
+    curl fftw ffmpeg gdk-pixbuf libaio libmtp loudmouth lz4 lzo mysql57.server mysql57.server.static
     pcre snappy taglib taglib_extras
   ];
 
diff --git a/pkgs/applications/audio/audacious/qt-5.nix b/pkgs/applications/audio/audacious/qt-5.nix
index 019bde7cc64a..baf7b108e504 100644
--- a/pkgs/applications/audio/audacious/qt-5.nix
+++ b/pkgs/applications/audio/audacious/qt-5.nix
@@ -2,7 +2,7 @@
   mkDerivation, lib, fetchurl, fetchpatch,
   gettext, pkgconfig,
   qtbase,
-  alsaLib, curl, faad2, ffmpeg, flac, fluidsynth, gdk_pixbuf, lame, libbs2b,
+  alsaLib, curl, faad2, ffmpeg, flac, fluidsynth, gdk-pixbuf, lame, libbs2b,
   libcddb, libcdio, libcue, libjack2, libmad, libmms, libmodplug,
   libmowgli, libnotify, libogg, libpulseaudio, libsamplerate, libsidplayfp,
   libsndfile, libvorbis, libxml2, lirc, mpg123, neon, qtmultimedia, soxr,
@@ -45,7 +45,7 @@ mkDerivation {
     qtbase
 
     # Plugin dependencies
-    alsaLib curl faad2 ffmpeg flac fluidsynth gdk_pixbuf lame libbs2b libcddb
+    alsaLib curl faad2 ffmpeg flac fluidsynth gdk-pixbuf lame libbs2b libcddb
     libcdio libcue libjack2 libmad libmms libmodplug libmowgli
     libnotify libogg libpulseaudio libsamplerate libsidplayfp libsndfile
     libvorbis libxml2 lirc mpg123 neon qtmultimedia soxr wavpack
diff --git a/pkgs/applications/audio/bitwig-studio/bitwig-studio1.nix b/pkgs/applications/audio/bitwig-studio/bitwig-studio1.nix
index 125c0f7a7536..31716fce1c21 100644
--- a/pkgs/applications/audio/bitwig-studio/bitwig-studio1.nix
+++ b/pkgs/applications/audio/bitwig-studio/bitwig-studio1.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, alsaLib, bzip2, cairo, dpkg, freetype, gdk_pixbuf
+{ stdenv, fetchurl, alsaLib, bzip2, cairo, dpkg, freetype, gdk-pixbuf
 , wrapGAppsHook, gtk2, gtk3, harfbuzz, jdk, lib, xorg
 , libbsd, libjack2, libpng, ffmpeg
 , libxkbcommon
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   dontWrapGApps = true; # we only want $gappsWrapperArgs here
 
   buildInputs = with xorg; [
-    alsaLib bzip2.out cairo freetype gdk_pixbuf gtk2 gtk3 harfbuzz libX11 libXau
+    alsaLib bzip2.out cairo freetype gdk-pixbuf gtk2 gtk3 harfbuzz libX11 libXau
     libXcursor libXdmcp libXext libXfixes libXrender libbsd libjack2 libpng libxcb
     libxkbfile pixman xcbutil xcbutilwm zlib
   ];
diff --git a/pkgs/applications/audio/cmusfm/default.nix b/pkgs/applications/audio/cmusfm/default.nix
index e528e9699a73..2147a84f24be 100644
--- a/pkgs/applications/audio/cmusfm/default.nix
+++ b/pkgs/applications/audio/cmusfm/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, curl, libnotify, gdk_pixbuf }:
+{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, curl, libnotify, gdk-pixbuf }:
 
 stdenv.mkDerivation rec {
   version = "2018-10-11";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   # building
   configureFlags = [ "--enable-libnotify" ];
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
-  buildInputs = [ curl libnotify gdk_pixbuf ];
+  buildInputs = [ curl libnotify gdk-pixbuf ];
 
   meta = with stdenv.lib; {
     description = "Last.fm and Libre.fm standalone scrobbler for the cmus music player";
diff --git a/pkgs/applications/audio/faust/faust2alsa.nix b/pkgs/applications/audio/faust/faust2alsa.nix
index 17cec46f6c6a..6af5af9bbafb 100644
--- a/pkgs/applications/audio/faust/faust2alsa.nix
+++ b/pkgs/applications/audio/faust/faust2alsa.nix
@@ -4,7 +4,7 @@
 , cairo
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gtk2
 , pango
@@ -20,7 +20,7 @@ faust.wrapWithBuildEnv {
     cairo
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk2
     pango
diff --git a/pkgs/applications/audio/google-play-music-desktop-player/default.nix b/pkgs/applications/audio/google-play-music-desktop-player/default.nix
index 5951572dd246..7716b1e0c355 100644
--- a/pkgs/applications/audio/google-play-music-desktop-player/default.nix
+++ b/pkgs/applications/audio/google-play-music-desktop-player/default.nix
@@ -1,5 +1,5 @@
 { stdenv, alsaLib, atk, cairo, cups, dbus, dpkg, expat, fontconfig, freetype
-, fetchurl, GConf, gdk_pixbuf, glib, gtk2, gtk3, libpulseaudio, makeWrapper, nspr
+, fetchurl, GConf, gdk-pixbuf, glib, gtk2, gtk3, libpulseaudio, makeWrapper, nspr
 , nss, pango, udev, xorg
 }:
 
@@ -16,7 +16,7 @@ let
     fontconfig
     freetype
     GConf
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk2
     gtk3
diff --git a/pkgs/applications/audio/gtkpod/default.nix b/pkgs/applications/audio/gtkpod/default.nix
index 0727ab56f7de..e01dbc1d30fe 100644
--- a/pkgs/applications/audio/gtkpod/default.nix
+++ b/pkgs/applications/audio/gtkpod/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, pkgconfig, wrapGAppsHook, intltool, libgpod, curl, flac,
   gnome3, gtk3, gettext, perlPackages, flex, libid3tag, gdl,
-  libvorbis, gdk_pixbuf }:
+  libvorbis, gdk-pixbuf }:
 
 stdenv.mkDerivation rec {
   version = "2.1.5";
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig wrapGAppsHook intltool ];
   buildInputs = [
     curl gettext
-    flex libgpod libid3tag flac libvorbis gtk3 gdk_pixbuf
+    flex libgpod libid3tag flac libvorbis gtk3 gdk-pixbuf
     gdl gnome3.adwaita-icon-theme gnome3.anjuta
   ] ++ (with perlPackages; [ perl XMLParser ]);
 
diff --git a/pkgs/applications/audio/quodlibet/default.nix b/pkgs/applications/audio/quodlibet/default.nix
index d457f25e3162..8db837105f82 100644
--- a/pkgs/applications/audio/quodlibet/default.nix
+++ b/pkgs/applications/audio/quodlibet/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, python3, wrapGAppsHook, gettext, libsoup, gnome3, gtk3, gdk_pixbuf,
+{ stdenv, fetchurl, python3, wrapGAppsHook, gettext, libsoup, gnome3, gtk3, gdk-pixbuf,
   tag ? "", xvfb_run, dbus, glibcLocales, glib, glib-networking, gobject-introspection,
   gst_all_1, withGstPlugins ? true,
   xineBackend ? false, xineLib,
@@ -20,7 +20,7 @@ python3.pkgs.buildPythonApplication rec {
 
   checkInputs = with python3.pkgs; [ pytest pytest_xdist pyflakes pycodestyle polib xvfb_run dbus.daemon glibcLocales ];
 
-  buildInputs = [ gnome3.adwaita-icon-theme libsoup glib glib-networking gtk3 webkitgtk gdk_pixbuf keybinder3 gtksourceview libmodplug libappindicator-gtk3 kakasi gobject-introspection ]
+  buildInputs = [ gnome3.adwaita-icon-theme libsoup glib glib-networking gtk3 webkitgtk gdk-pixbuf keybinder3 gtksourceview libmodplug libappindicator-gtk3 kakasi gobject-introspection ]
     ++ (if xineBackend then [ xineLib ] else with gst_all_1;
     [ gstreamer gst-plugins-base ] ++ optionals withGstPlugins [ gst-plugins-good gst-plugins-ugly gst-plugins-bad ]);
 
diff --git a/pkgs/applications/audio/reaper/default.nix b/pkgs/applications/audio/reaper/default.nix
index 95a08b59b00e..0c1d91254da1 100644
--- a/pkgs/applications/audio/reaper/default.nix
+++ b/pkgs/applications/audio/reaper/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, autoPatchelfHook, makeWrapper
 , alsaLib, xorg
-, gtk3, pango, gdk_pixbuf, cairo, glib, freetype
+, gtk3, pango, gdk-pixbuf, cairo, glib, freetype
 , libpulseaudio, xdg_utils
 }:
 
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     xorg.libX11
     xorg.libXi
 
-    gdk_pixbuf
+    gdk-pixbuf
     pango
     cairo
     glib
diff --git a/pkgs/applications/audio/spotify/default.nix b/pkgs/applications/audio/spotify/default.nix
index 6e926fe11c3d..77aa79949943 100644
--- a/pkgs/applications/audio/spotify/default.nix
+++ b/pkgs/applications/audio/spotify/default.nix
@@ -1,5 +1,5 @@
 { fetchurl, stdenv, squashfsTools, xorg, alsaLib, makeWrapper, openssl, freetype
-, glib, pango, cairo, atk, gdk_pixbuf, gtk2, cups, nspr, nss, libpng, libnotify
+, glib, pango, cairo, atk, gdk-pixbuf, gtk2, cups, nspr, nss, libpng, libnotify
 , libgcrypt, systemd, fontconfig, dbus, expat, ffmpeg_3, curl, zlib, gnome3
 , at-spi2-atk
 }:
@@ -32,7 +32,7 @@ let
     ffmpeg_3
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk2
     libgcrypt
diff --git a/pkgs/applications/audio/transcribe/default.nix b/pkgs/applications/audio/transcribe/default.nix
index 29021e870afc..740790419482 100644
--- a/pkgs/applications/audio/transcribe/default.nix
+++ b/pkgs/applications/audio/transcribe/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, wrapGAppsHook, alsaLib, atk, cairo, gdk_pixbuf
+{ stdenv, fetchzip, wrapGAppsHook, alsaLib, atk, cairo, gdk-pixbuf
 , glib, gst_all_1,  gtk3, libSM, libX11, libpng12, pango, zlib }:
 
 stdenv.mkDerivation rec {
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   dontPatchELF = true;
 
   libPath = with gst_all_1; stdenv.lib.makeLibraryPath [
-    stdenv.cc.cc glib gtk3 atk pango cairo gdk_pixbuf alsaLib
+    stdenv.cc.cc glib gtk3 atk pango cairo gdk-pixbuf alsaLib
     libX11 libSM libpng12 gstreamer gst-plugins-base zlib
   ];
 
diff --git a/pkgs/applications/backup/crashplan/crashplan-small-business.nix b/pkgs/applications/backup/crashplan/crashplan-small-business.nix
index 2016d21c5926..5db4badeb6c0 100644
--- a/pkgs/applications/backup/crashplan/crashplan-small-business.nix
+++ b/pkgs/applications/backup/crashplan/crashplan-small-business.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, makeWrapper, getopt, jre, cpio, gawk, gnugrep, gnused,
-  procps, which, gtk2, atk, glib, pango, gdk_pixbuf, cairo, freetype,
+  procps, which, gtk2, atk, glib, pango, gdk-pixbuf, cairo, freetype,
   fontconfig, dbus, gconf, nss, nspr, alsaLib, cups, expat, udev,
   libX11, libxcb, libXi, libXcursor, libXdamage, libXrandr, libXcomposite,
   libXext, libXfixes, libXrender, libXtst, libXScrnSaver, nodePackages,
@@ -86,7 +86,7 @@ stdenv.mkDerivation rec {
   postFixup = ''
     patchelf --set-interpreter ${stdenv.glibc}/lib/ld-linux-x86-64.so.2 $out/electron/crashplan
     wrapProgram $out/bin/CrashPlanDesktop --prefix LD_LIBRARY_PATH ":" "${stdenv.lib.makeLibraryPath [
-      stdenv.cc.cc.lib gtk2 atk glib pango gdk_pixbuf cairo freetype
+      stdenv.cc.cc.lib gtk2 atk glib pango gdk-pixbuf cairo freetype
       fontconfig dbus gconf nss nspr alsaLib cups expat udev
       libX11 libxcb libXi libXcursor libXdamage libXrandr libXcomposite
       libXext libXfixes libXrender libXtst libXScrnSaver]}"
diff --git a/pkgs/applications/display-managers/lightdm-enso-os-greeter/default.nix b/pkgs/applications/display-managers/lightdm-enso-os-greeter/default.nix
index 38270a25c9c9..45fd3cb8cbb7 100644
--- a/pkgs/applications/display-managers/lightdm-enso-os-greeter/default.nix
+++ b/pkgs/applications/display-managers/lightdm-enso-os-greeter/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchgit, pkgconfig
 , dbus, pcre, epoxy, libXdmcp, at-spi2-core, libxklavier, libxkbcommon, libpthreadstubs
-, gtk3, vala, cmake, libgee, libX11, lightdm, gdk_pixbuf, clutter-gtk }:
+, gtk3, vala, cmake, libgee, libX11, lightdm, gdk-pixbuf, clutter-gtk }:
 
 stdenv.mkDerivation rec {
   version = "0.2.1";
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     libX11
     lightdm
     libXdmcp
-    gdk_pixbuf
+    gdk-pixbuf
     clutter-gtk
     libxklavier
     at-spi2-core
diff --git a/pkgs/applications/editors/atom/env.nix b/pkgs/applications/editors/atom/env.nix
index da78c39324a5..46dd4a228645 100644
--- a/pkgs/applications/editors/atom/env.nix
+++ b/pkgs/applications/editors/atom/env.nix
@@ -1,12 +1,12 @@
 { stdenv, lib, zlib, glib, alsaLib, dbus, gtk3, atk, pango, freetype, fontconfig
-, libgnome-keyring3, gdk_pixbuf, cairo, cups, expat, libgpgerror, nspr
+, libgnome-keyring3, gdk-pixbuf, cairo, cups, expat, libgpgerror, nspr
 , gconf, nss, xorg, libcap, systemd, libnotify, libsecret
 }:
 
 let
   packages = [
     stdenv.cc.cc zlib glib dbus gtk3 atk pango freetype libgnome-keyring3
-    fontconfig gdk_pixbuf cairo cups expat libgpgerror alsaLib nspr gconf nss
+    fontconfig gdk-pixbuf cairo cups expat libgpgerror alsaLib nspr gconf nss
     xorg.libXrender xorg.libX11 xorg.libXext xorg.libXdamage xorg.libXtst
     xorg.libXcomposite xorg.libXi xorg.libXfixes xorg.libXrandr
     xorg.libXcursor xorg.libxkbfile xorg.libXScrnSaver libcap systemd libnotify
diff --git a/pkgs/applications/editors/brackets/default.nix b/pkgs/applications/editors/brackets/default.nix
index ce9f10f39c41..17ae40521986 100644
--- a/pkgs/applications/editors/brackets/default.nix
+++ b/pkgs/applications/editors/brackets/default.nix
@@ -1,10 +1,10 @@
-{ stdenv, fetchurl, gtk2, glib, gdk_pixbuf, alsaLib, nss, nspr, gconf
+{ stdenv, fetchurl, gtk2, glib, gdk-pixbuf, alsaLib, nss, nspr, gconf
 , cups, libgcrypt_1_5, systemd, dbus, libXdamage, expat }:
 with stdenv.lib;
 
 let
   bracketsLibs = makeLibraryPath [
-    gtk2 glib gdk_pixbuf stdenv.cc.cc.lib alsaLib nss nspr gconf cups libgcrypt_1_5 dbus systemd libXdamage expat
+    gtk2 glib gdk-pixbuf stdenv.cc.cc.lib alsaLib nss nspr gconf cups libgcrypt_1_5 dbus systemd libXdamage expat
   ];
 in
 stdenv.mkDerivation rec {
diff --git a/pkgs/applications/editors/lighttable/default.nix b/pkgs/applications/editors/lighttable/default.nix
index dfd6543c5985..c3a280aed921 100644
--- a/pkgs/applications/editors/lighttable/default.nix
+++ b/pkgs/applications/editors/lighttable/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, zlib, glib, alsaLib, makeDesktopItem
-, dbus, gtk2, atk, pango, freetype, fontconfig, libgnome-keyring3, gdk_pixbuf
+, dbus, gtk2, atk, pango, freetype, fontconfig, libgnome-keyring3, gdk-pixbuf
 , cairo, cups, expat, libgpgerror, nspr, gnome2, nss, xorg, systemd, libnotify
 }:
 
 let
   libPath = stdenv.lib.makeLibraryPath [
       stdenv.cc.cc zlib glib dbus gtk2 atk pango freetype libgnome-keyring3 nss
-      fontconfig gdk_pixbuf cairo cups expat libgpgerror alsaLib nspr gnome2.GConf
+      fontconfig gdk-pixbuf cairo cups expat libgpgerror alsaLib nspr gnome2.GConf
       xorg.libXrender xorg.libX11 xorg.libXext xorg.libXdamage xorg.libXtst
       xorg.libXcomposite xorg.libXi xorg.libXfixes libnotify xorg.libXrandr
       xorg.libXcursor
diff --git a/pkgs/applications/editors/rednotebook/default.nix b/pkgs/applications/editors/rednotebook/default.nix
index de9a089ec8c6..11154250e583 100644
--- a/pkgs/applications/editors/rednotebook/default.nix
+++ b/pkgs/applications/editors/rednotebook/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonApplication, fetchFromGitHub
-, gdk_pixbuf, glib, gobject-introspection, gtk3, gtksourceview, pango, webkitgtk
+, gdk-pixbuf, glib, gobject-introspection, gtk3, gtksourceview, pango, webkitgtk
 , pygobject3, pyyaml
 }:
 
@@ -20,7 +20,7 @@ buildPythonApplication rec {
   nativeBuildInputs = [ gobject-introspection ];
 
   propagatedBuildInputs = [
-    gdk_pixbuf glib gtk3 gtksourceview pango webkitgtk
+    gdk-pixbuf glib gtk3 gtksourceview pango webkitgtk
     pygobject3 pyyaml
   ];
 
diff --git a/pkgs/applications/graphics/avocode/default.nix b/pkgs/applications/graphics/avocode/default.nix
index 57631037cd0e..140548cd20ac 100644
--- a/pkgs/applications/graphics/avocode/default.nix
+++ b/pkgs/applications/graphics/avocode/default.nix
@@ -1,5 +1,5 @@
 { stdenv, makeDesktopItem, fetchurl, unzip
-, gdk_pixbuf, glib, gtk3, atk, at-spi2-atk, pango, cairo, freetype, fontconfig, dbus, nss, nspr, alsaLib, cups, expat, udev, gnome3
+, gdk-pixbuf, glib, gtk3, atk, at-spi2-atk, pango, cairo, freetype, fontconfig, dbus, nss, nspr, alsaLib, cups, expat, udev, gnome3
 , xorg, mozjpeg, makeWrapper, wrapGAppsHook, hicolor-icon-theme, libuuid
 }:
 
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   libPath = stdenv.lib.makeLibraryPath (with xorg; [
     stdenv.cc.cc.lib
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk3
     atk
diff --git a/pkgs/applications/graphics/drawio/default.nix b/pkgs/applications/graphics/drawio/default.nix
index 70cf1c149ab1..4d5dbeb35b1a 100644
--- a/pkgs/applications/graphics/drawio/default.nix
+++ b/pkgs/applications/graphics/drawio/default.nix
@@ -2,7 +2,7 @@
 
 # Dynamic libraries
 , alsaLib, atk, at-spi2-atk, at-spi2-core, cairo, dbus, cups, expat
-, gdk_pixbuf, glib, gtk3, libX11, libXScrnSaver, libXcomposite, libXcursor
+, gdk-pixbuf, glib, gtk3, libX11, libXScrnSaver, libXcomposite, libXcursor
 , libXdamage, libXext, libXfixes, libXi, libXrandr, libXrender, libXtst
 , libxcb, libuuid, nspr, nss, pango
 
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
     cups
     dbus
     expat
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk3
     libX11
diff --git a/pkgs/applications/graphics/gimp/default.nix b/pkgs/applications/graphics/gimp/default.nix
index 16b520fa7ed3..e3994b1b4128 100644
--- a/pkgs/applications/graphics/gimp/default.nix
+++ b/pkgs/applications/graphics/gimp/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, substituteAll, pkgconfig, intltool, babl, gegl, gtk2, glib, gdk_pixbuf, isocodes
+{ stdenv, fetchurl, substituteAll, pkgconfig, intltool, babl, gegl, gtk2, glib, gdk-pixbuf, isocodes
 , pango, cairo, freetype, fontconfig, lcms, libpng, libjpeg, poppler, poppler_data, libtiff
 , libmng, librsvg, libwmf, zlib, libzip, ghostscript, aalib, shared-mime-info
 , python2Packages, libexif, gettext, xorg, glib-networking, libmypaint, gexiv2
@@ -19,7 +19,7 @@ in stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig intltool gettext wrapPython ];
   propagatedBuildInputs = [ gegl ]; # needed by gimp-2.0.pc
   buildInputs = [
-    babl gegl gtk2 glib gdk_pixbuf pango cairo gexiv2 harfbuzz isocodes
+    babl gegl gtk2 glib gdk-pixbuf pango cairo gexiv2 harfbuzz isocodes
     freetype fontconfig lcms libpng libjpeg poppler poppler_data libtiff openexr
     libmng librsvg libwmf zlib libzip ghostscript aalib shared-mime-info libwebp libheif
     python pygtk libexif xorg.libXpm glib-networking libmypaint mypaint-brushes
@@ -30,7 +30,7 @@ in stdenv.mkDerivation rec {
   pythonPath = [ pygtk ];
 
   # Check if librsvg was built with --disable-pixbuf-loader.
-  PKG_CONFIG_GDK_PIXBUF_2_0_GDK_PIXBUF_MODULEDIR = "${librsvg}/${gdk_pixbuf.moduleDir}";
+  PKG_CONFIG_GDK_PIXBUF_2_0_GDK_PIXBUF_MODULEDIR = "${librsvg}/${gdk-pixbuf.moduleDir}";
 
   preConfigure = ''
     # The check runs before glib-networking is registered
diff --git a/pkgs/applications/graphics/giv/default.nix b/pkgs/applications/graphics/giv/default.nix
index c5eb126cfbf7..ec708ad971a4 100644
--- a/pkgs/applications/graphics/giv/default.nix
+++ b/pkgs/applications/graphics/giv/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, gdk_pixbuf, scons, pkgconfig, gtk2, glib
+{ stdenv, fetchFromGitHub, gdk-pixbuf, scons, pkgconfig, gtk2, glib
 , pcre, cfitsio, perl, gob2, vala, libtiff, json-glib }:
 
 stdenv.mkDerivation rec {
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   patches = [ ./build.patch ];
 
   nativeBuildInputs = [ scons pkgconfig vala perl gob2 ];
-  buildInputs = [ gdk_pixbuf gtk2 glib pcre cfitsio libtiff json-glib ];
+  buildInputs = [ gdk-pixbuf gtk2 glib pcre cfitsio libtiff json-glib ];
 
   meta = with stdenv.lib; {
     description = "Cross platform image and hierarchical vector viewer based";
diff --git a/pkgs/applications/graphics/mypaint/default.nix b/pkgs/applications/graphics/mypaint/default.nix
index 36c7e7e2fb30..466ab3e26fb8 100644
--- a/pkgs/applications/graphics/mypaint/default.nix
+++ b/pkgs/applications/graphics/mypaint/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, gtk3, intltool, json_c, lcms2, libpng, librsvg, gobject-introspection, hicolor-icon-theme
-, gdk_pixbuf, pkgconfig, python2Packages, scons, swig, wrapGAppsHook }:
+, gdk-pixbuf, pkgconfig, python2Packages, scons, swig, wrapGAppsHook }:
 
 let
   inherit (python2Packages) python pycairo pygobject3 numpy;
@@ -21,7 +21,7 @@ in stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    gtk3 gdk_pixbuf json_c lcms2 libpng librsvg pycairo pygobject3 python hicolor-icon-theme
+    gtk3 gdk-pixbuf json_c lcms2 libpng librsvg pycairo pygobject3 python hicolor-icon-theme
   ];
 
   propagatedBuildInputs = [ numpy ];
diff --git a/pkgs/applications/graphics/pencil/default.nix b/pkgs/applications/graphics/pencil/default.nix
index de7582710048..f622d3f388e2 100644
--- a/pkgs/applications/graphics/pencil/default.nix
+++ b/pkgs/applications/graphics/pencil/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, lib, makeWrapper,
   # build dependencies
   alsaLib, atk, cairo, cups, dbus, expat, fontconfig,
-  freetype, gdk_pixbuf, glib, gnome2, nspr, nss, xorg,
+  freetype, gdk-pixbuf, glib, gnome2, nspr, nss, xorg,
   glibc, systemd
 }:
 
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
       expat
       fontconfig
       freetype
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       gnome2.GConf
       gnome2.gtk
diff --git a/pkgs/applications/graphics/rapid-photo-downloader/default.nix b/pkgs/applications/graphics/rapid-photo-downloader/default.nix
index b244bed9294b..5991a3351ee1 100644
--- a/pkgs/applications/graphics/rapid-photo-downloader/default.nix
+++ b/pkgs/applications/graphics/rapid-photo-downloader/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, python3Packages
 , file, intltool, gobject-introspection, libgudev
 , udisks, gexiv2, gst_all_1, libnotify
-, exiftool, gdk_pixbuf, libmediainfo, vmtouch
+, exiftool, gdk-pixbuf, libmediainfo, vmtouch
 }:
 
 python3Packages.buildPythonApplication rec {
@@ -33,7 +33,7 @@ python3Packages.buildPythonApplication rec {
   # NOTE: Without gobject-introspection in buildInputs, launching fails with
   #       "Namespace [Notify / GExiv2 / GUdev] not available"
   buildInputs = [
-    gdk_pixbuf
+    gdk-pixbuf
     gexiv2
     gobject-introspection
     gst_all_1.gst-libav
diff --git a/pkgs/applications/graphics/shotwell/default.nix b/pkgs/applications/graphics/shotwell/default.nix
index 294737ee7335..79bc743fbf01 100644
--- a/pkgs/applications/graphics/shotwell/default.nix
+++ b/pkgs/applications/graphics/shotwell/default.nix
@@ -24,7 +24,7 @@
 , librest
 , gettext
 , desktop-file-utils
-, gdk_pixbuf
+, gdk-pixbuf
 , librsvg
 , wrapGAppsHook
 , gobject-introspection
@@ -77,7 +77,7 @@ stdenv.mkDerivation rec {
     libraw
     json-glib
     glib
-    gdk_pixbuf
+    gdk-pixbuf
     librsvg
     librest
     gcr
diff --git a/pkgs/applications/graphics/shutter/default.nix b/pkgs/applications/graphics/shutter/default.nix
index 18754b2b854b..527a21f93fe3 100644
--- a/pkgs/applications/graphics/shutter/default.nix
+++ b/pkgs/applications/graphics/shutter/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, perlPackages, makeWrapper, imagemagick, gdk_pixbuf, librsvg
+{ stdenv, fetchurl, perlPackages, makeWrapper, imagemagick, gdk-pixbuf, librsvg
 , hicolor-icon-theme, procps
 }:
 
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ makeWrapper ];
-  buildInputs = [ perlPackages.perl procps gdk_pixbuf librsvg ] ++ perlModules;
+  buildInputs = [ perlPackages.perl procps gdk-pixbuf librsvg ] ++ perlModules;
 
   installPhase = ''
     mkdir -p "$out"
diff --git a/pkgs/applications/graphics/viewnior/default.nix b/pkgs/applications/graphics/viewnior/default.nix
index 5afd7a0237d0..48930ccbbb96 100644
--- a/pkgs/applications/graphics/viewnior/default.nix
+++ b/pkgs/applications/graphics/viewnior/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, gtk2, libpng, exiv2, lcms
-, intltool, gettext, shared-mime-info, glib, gdk_pixbuf, perl}:
+, intltool, gettext, shared-mime-info, glib, gdk-pixbuf, perl}:
 
 stdenv.mkDerivation rec {
   name = "viewnior-${version}";
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ autoreconfHook ];
   buildInputs =
     [ pkgconfig gtk2 libpng exiv2 lcms intltool gettext
-      shared-mime-info glib gdk_pixbuf perl
+      shared-mime-info glib gdk-pixbuf perl
     ];
 
   preFixup = ''
diff --git a/pkgs/applications/misc/adobe-reader/default.nix b/pkgs/applications/misc/adobe-reader/default.nix
index 0ca12a0096ed..d1e4856e0523 100644
--- a/pkgs/applications/misc/adobe-reader/default.nix
+++ b/pkgs/applications/misc/adobe-reader/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, libX11, cups, zlib, libxml2, pango, atk, gtk2, glib
-, gdk_pixbuf }:
+, gdk-pixbuf }:
 
 assert stdenv.hostPlatform.system == "i686-linux";
 
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
   # versions.
 
   libPath = stdenv.lib.makeLibraryPath
-    [ stdenv.cc.cc libX11 zlib libxml2 cups pango atk gtk2 glib gdk_pixbuf ];
+    [ stdenv.cc.cc libX11 zlib libxml2 cups pango atk gtk2 glib gdk-pixbuf ];
 
   passthru.mozillaPlugin = "/libexec/adobe-reader/Browser/intellinux";
 
diff --git a/pkgs/applications/misc/airtame/default.nix b/pkgs/applications/misc/airtame/default.nix
index 3e5bf8df4a7b..50582d94ff4a 100644
--- a/pkgs/applications/misc/airtame/default.nix
+++ b/pkgs/applications/misc/airtame/default.nix
@@ -1,12 +1,12 @@
 { stdenv, lib, fetchurl, makeDesktopItem, makeWrapper
 , alsaLib, atk, cairo, cups, curl, dbus, expat, ffmpeg, fontconfig, freetype
-, gdk_pixbuf, glib, glibc, gnome2, gtk2, libX11, libXScrnSaver, libXcomposite
+, gdk-pixbuf, glib, glibc, gnome2, gtk2, libX11, libXScrnSaver, libXcomposite
 , libXcursor, libXdamage, libXext, libXfixes, libXi, libXrandr, libXrender
 , libXtst, libopus, libpulseaudio, libxcb, nspr, nss, pango, udev, x264
 }:
 
 let libPath = lib.makeLibraryPath [
-  alsaLib atk cairo cups curl dbus expat ffmpeg fontconfig freetype gdk_pixbuf
+  alsaLib atk cairo cups curl dbus expat ffmpeg fontconfig freetype gdk-pixbuf
   glib glibc gnome2.GConf gtk2 libopus nspr nss pango stdenv.cc.cc udev x264
   libX11 libXScrnSaver libXcomposite libXcursor libXdamage libXext libXfixes
   libXi libXrandr libXrender libXtst libpulseaudio libxcb
diff --git a/pkgs/applications/misc/batti/default.nix b/pkgs/applications/misc/batti/default.nix
index 9322aefb2d69..abb3eb33536e 100644
--- a/pkgs/applications/misc/batti/default.nix
+++ b/pkgs/applications/misc/batti/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl
 , pkgconfig, gettext, pythonPackages
-, gtk2, gdk_pixbuf, upower
+, gtk2, gdk-pixbuf, upower
 , makeWrapper }:
 
 let
@@ -16,7 +16,7 @@ in stdenv.mkDerivation rec {
   };
 
   buildInputs = with stdenv.lib;
-  [ pkgconfig gettext python gtk2 pygtk dbus-python gdk_pixbuf upower makeWrapper ];
+  [ pkgconfig gettext python gtk2 pygtk dbus-python gdk-pixbuf upower makeWrapper ];
 
   dontConfigure = true;
 
diff --git a/pkgs/applications/misc/dunst/default.nix b/pkgs/applications/misc/dunst/default.nix
index 35073db2ae14..7da2ae421d7a 100644
--- a/pkgs/applications/misc/dunst/default.nix
+++ b/pkgs/applications/misc/dunst/default.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchFromGitHub, makeWrapper
 , pkgconfig, which, perl, libXrandr
-, cairo, dbus, systemd, gdk_pixbuf, glib, libX11, libXScrnSaver
+, cairo, dbus, systemd, gdk-pixbuf, glib, libX11, libXScrnSaver
 , libXinerama, libnotify, pango, xorgproto, librsvg, dunstify ? false
 }:
 
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ perl pkgconfig which systemd makeWrapper ];
 
   buildInputs = [
-    cairo dbus gdk_pixbuf glib libX11 libXScrnSaver
+    cairo dbus gdk-pixbuf glib libX11 libXScrnSaver
     libXinerama libnotify pango xorgproto librsvg libXrandr
   ];
 
diff --git a/pkgs/applications/misc/et/default.nix b/pkgs/applications/misc/et/default.nix
index 4aaaa3339982..bf1ae3037fc4 100644
--- a/pkgs/applications/misc/et/default.nix
+++ b/pkgs/applications/misc/et/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, pkgconfig, libnotify, gdk_pixbuf }:
+{ stdenv, fetchFromGitHub, pkgconfig, libnotify, gdk-pixbuf }:
 
 stdenv.mkDerivation rec {
   name = "et-${version}";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "167w9qwfpd63rgy0xmkkkh5krmd91q42c3ijy3j099krgdfbb9bc";
   };
 
-  buildInputs = [ libnotify gdk_pixbuf ];
+  buildInputs = [ libnotify gdk-pixbuf ];
   nativeBuildInputs = [ pkgconfig ];
 
   installPhase = ''
diff --git a/pkgs/applications/misc/evilvte/default.nix b/pkgs/applications/misc/evilvte/default.nix
index c7fcf18e4e3d..4746f4ead1bb 100644
--- a/pkgs/applications/misc/evilvte/default.nix
+++ b/pkgs/applications/misc/evilvte/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchgit, makeWrapper, pkgconfig,
-  gnome2, glib, pango, cairo, gdk_pixbuf, atk, freetype, xorg,
+  gnome2, glib, pango, cairo, gdk-pixbuf, atk, freetype, xorg,
   configH ? ""
 }:
 
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [
-    gnome2.vte glib pango gnome2.gtk cairo gdk_pixbuf atk freetype xorg.libX11
+    gnome2.vte glib pango gnome2.gtk cairo gdk-pixbuf atk freetype xorg.libX11
     xorg.xorgproto xorg.libXext makeWrapper pkgconfig
   ];
 
diff --git a/pkgs/applications/misc/green-pdfviewer/default.nix b/pkgs/applications/misc/green-pdfviewer/default.nix
index 00421a2e0334..cb4f4748eec1 100644
--- a/pkgs/applications/misc/green-pdfviewer/default.nix
+++ b/pkgs/applications/misc/green-pdfviewer/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, poppler, pkgconfig, gdk_pixbuf, SDL, gtk2 }:
+{ stdenv, fetchFromGitHub, poppler, pkgconfig, gdk-pixbuf, SDL, gtk2 }:
 
 stdenv.mkDerivation rec {
   name = "green-pdfviewer-${version}";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ poppler gdk_pixbuf SDL gtk2 ];
+  buildInputs = [ poppler gdk-pixbuf SDL gtk2 ];
 
   patches = [
     ./gdk-libs.patch
diff --git a/pkgs/applications/misc/hyper/default.nix b/pkgs/applications/misc/hyper/default.nix
index 2fd7e2f94af0..f8d808a49c29 100644
--- a/pkgs/applications/misc/hyper/default.nix
+++ b/pkgs/applications/misc/hyper/default.nix
@@ -1,11 +1,11 @@
-{ stdenv, lib, fetchurl, dpkg, atk, glib, pango, gdk_pixbuf, gnome2, gtk2, cairo
+{ stdenv, lib, fetchurl, dpkg, atk, glib, pango, gdk-pixbuf, gnome2, gtk2, cairo
 , freetype, fontconfig, dbus, libXi, libXcursor, libXdamage, libXrandr
 , libXcomposite, libXext, libXfixes, libXrender, libX11, libXtst, libXScrnSaver
 , libxcb, nss, nspr, alsaLib, cups, expat, udev, libpulseaudio }:
 
 let
   libPath = stdenv.lib.makeLibraryPath [
-    stdenv.cc.cc gtk2 gnome2.GConf atk glib pango gdk_pixbuf cairo freetype fontconfig dbus
+    stdenv.cc.cc gtk2 gnome2.GConf atk glib pango gdk-pixbuf cairo freetype fontconfig dbus
     libXi libXcursor libXdamage libXrandr libXcomposite libXext libXfixes libxcb
     libXrender libX11 libXtst libXScrnSaver nss nspr alsaLib cups expat udev libpulseaudio
   ];
diff --git a/pkgs/applications/misc/kiwix/default.nix b/pkgs/applications/misc/kiwix/default.nix
index bc49e810d4e5..01aef93e5e5f 100644
--- a/pkgs/applications/misc/kiwix/default.nix
+++ b/pkgs/applications/misc/kiwix/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, makeWrapper, pkgconfig
 , zip, python, zlib, which, icu, libmicrohttpd, lzma, aria2, wget, bc
 , libuuid, libX11, libXext, libXt, libXrender, glib, dbus, dbus-glib
-, gtk2, gdk_pixbuf, pango, cairo, freetype, fontconfig, alsaLib, atk, cmake
+, gtk2, gdk-pixbuf, pango, cairo, freetype, fontconfig, alsaLib, atk, cmake
 , xapian, ctpp2, zimlib
 }:
 
@@ -93,7 +93,7 @@ stdenv.mkDerivation rec {
 
     rm $out/bin/kiwix
     makeWrapper $out/lib/kiwix/kiwix-launcher $out/bin/kiwix \
-      --suffix LD_LIBRARY_PATH : ${makeLibraryPath [stdenv.cc.cc libX11 libXext libXt libXrender glib dbus dbus-glib gtk2 gdk_pixbuf pango cairo freetype fontconfig alsaLib atk]} \
+      --suffix LD_LIBRARY_PATH : ${makeLibraryPath [stdenv.cc.cc libX11 libXext libXt libXrender glib dbus dbus-glib gtk2 gdk-pixbuf pango cairo freetype fontconfig alsaLib atk]} \
       --suffix PATH : ${aria2}/bin
   '';
 
diff --git a/pkgs/applications/misc/lutris/default.nix b/pkgs/applications/misc/lutris/default.nix
index 0f2274ad2592..7ccd4d6e5e90 100644
--- a/pkgs/applications/misc/lutris/default.nix
+++ b/pkgs/applications/misc/lutris/default.nix
@@ -1,6 +1,6 @@
 { buildPythonApplication, lib, fetchFromGitHub
 , wrapGAppsHook, gobject-introspection, gnome-desktop, libnotify, libgnome-keyring, pango
-, gdk_pixbuf, atk, webkitgtk, gst_all_1
+, gdk-pixbuf, atk, webkitgtk, gst_all_1
 , evdev, pyyaml, pygobject3, requests, pillow
 , xrandr, pciutils, psmisc, glxinfo, vulkan-tools, xboxdrv, pulseaudio, p7zip, xgamma
 , libstrangle, wine, fluidsynth, xorgserver
@@ -42,7 +42,7 @@ in buildPythonApplication rec {
 
   buildInputs = [
     wrapGAppsHook gobject-introspection gnome-desktop libnotify libgnome-keyring pango
-    gdk_pixbuf atk webkitgtk
+    gdk-pixbuf atk webkitgtk
   ] ++ gstDeps;
 
   makeWrapperArgs = [
diff --git a/pkgs/applications/misc/mako/default.nix b/pkgs/applications/misc/mako/default.nix
index 32aa15b09e49..afa1ba5e7518 100644
--- a/pkgs/applications/misc/mako/default.nix
+++ b/pkgs/applications/misc/mako/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, meson, ninja, pkgconfig, scdoc
-, systemd, pango, cairo, gdk_pixbuf
+, systemd, pango, cairo, gdk-pixbuf
 , wayland, wayland-protocols
 , fetchpatch }:
 
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   ];
 
   nativeBuildInputs = [ meson ninja pkgconfig scdoc wayland-protocols ];
-  buildInputs = [ systemd pango cairo gdk_pixbuf wayland ];
+  buildInputs = [ systemd pango cairo gdk-pixbuf wayland ];
 
   mesonFlags = [
     "-Dicons=enabled" "-Dman-pages=enabled" "-Dzsh-completions=true"
diff --git a/pkgs/applications/misc/mlterm/default.nix b/pkgs/applications/misc/mlterm/default.nix
index 2cfa6010853f..46ba9d450c8f 100644
--- a/pkgs/applications/misc/mlterm/default.nix
+++ b/pkgs/applications/misc/mlterm/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, autoconf, makeDesktopItem
-, libX11, gdk_pixbuf, cairo, libXft, gtk3, vte
+, libX11, gdk-pixbuf, cairo, libXft, gtk3, vte
 , harfbuzz #substituting glyphs with opentype fonts
 , fribidi, m17n_lib #bidi and encoding
 , openssl, libssh2 #build-in ssh
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig autoconf ];
   buildInputs = [
-    libX11 gdk_pixbuf.dev cairo libXft gtk3 vte
+    libX11 gdk-pixbuf.dev cairo libXft gtk3 vte
     harfbuzz fribidi m17n_lib openssl libssh2
   ];
 
diff --git a/pkgs/applications/misc/navit/default.nix b/pkgs/applications/misc/navit/default.nix
index 8dc288c01625..e8497dbc7bda 100644
--- a/pkgs/applications/misc/navit/default.nix
+++ b/pkgs/applications/misc/navit/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, pkgconfig, gtk2, fontconfig, freetype, imlib2
 , SDL_image, libGLU_combined, libXmu, freeglut, pcre, dbus, dbus-glib, glib
-, librsvg, freeimage, libxslt, cairo, gdk_pixbuf, pango
+, librsvg, freeimage, libxslt, cairo, gdk-pixbuf, pango
 , atk, patchelf, fetchurl, bzip2, python, gettext, quesoglc
 , gd, cmake, shapelib, SDL_ttf, fribidi, makeWrapper
 , qtquickcontrols, qtmultimedia, qtspeech, qtsensors
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
     gtk2 fontconfig freetype imlib2 libGLU_combined freeimage
     libxslt libXmu freeglut python gettext quesoglc gd
     fribidi pcre  dbus dbus-glib librsvg shapelib glib
-    cairo gdk_pixbuf pango atk
+    cairo gdk-pixbuf pango atk
   ] ++ optionals sdlSupport [ SDL SDL_ttf SDL_image ]
     ++ optional postgresqlSupport postgresql
     ++ optional speechdSupport speechd
diff --git a/pkgs/applications/misc/plank/default.nix b/pkgs/applications/misc/plank/default.nix
index 8aff573ab839..d5a071fcb54b 100644
--- a/pkgs/applications/misc/plank/default.nix
+++ b/pkgs/applications/misc/plank/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, vala, atk, cairo, glib, gnome3, gtk3, libwnck3
 , libX11, libXfixes, libXi, pango, intltool, pkgconfig, libxml2
-, bamf, gdk_pixbuf, libdbusmenu-gtk3, file, gnome-menus, libgee
+, bamf, gdk-pixbuf, libdbusmenu-gtk3, file, gnome-menus, libgee
 , wrapGAppsHook, autoreconfHook, pantheon }:
 
 stdenv.mkDerivation rec {
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
     atk
     bamf
     cairo
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome-menus
     gnome3.dconf
diff --git a/pkgs/applications/misc/polar-bookshelf/default.nix b/pkgs/applications/misc/polar-bookshelf/default.nix
index 11c643fac2c3..81e3d80f5167 100644
--- a/pkgs/applications/misc/polar-bookshelf/default.nix
+++ b/pkgs/applications/misc/polar-bookshelf/default.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, makeWrapper, fetchurl
 , dpkg, wrapGAppsHook, autoPatchelfHook
-, gtk3, cairo, gnome2, atk, gdk_pixbuf, glib
+, gtk3, cairo, gnome2, atk, gdk-pixbuf, glib
 , at-spi2-atk, dbus, libX11, libxcb, libXi
 , libXcursor, libXdamage, libXrandr, libXcomposite
 , libXext, libXfixes, libXrender, libXtst, libXScrnSaver
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
     cairo
     gnome2.pango
     atk
-    gdk_pixbuf
+    gdk-pixbuf
     at-spi2-atk
     dbus
     libX11
@@ -48,10 +48,10 @@ stdenv.mkDerivation rec {
     expat
   ];
 
-  nativeBuildInputs = [ 
+  nativeBuildInputs = [
     wrapGAppsHook
     autoPatchelfHook
-    makeWrapper 
+    makeWrapper
     dpkg
   ];
 
@@ -70,7 +70,7 @@ stdenv.mkDerivation rec {
     mv usr/share/* $out/share/
 
     ln -s $out/share/polar-bookshelf/polar-bookshelf $out/bin/polar-bookshelf
-    
+
     # Correct desktop file `Exec`
     substituteInPlace $out/share/applications/polar-bookshelf.desktop \
       --replace "/opt/Polar Bookshelf/polar-bookshelf" "$out/bin/polar-bookshelf"
diff --git a/pkgs/applications/misc/roxterm/default.nix b/pkgs/applications/misc/roxterm/default.nix
index 11a75e4064f4..aa0ebc29a557 100644
--- a/pkgs/applications/misc/roxterm/default.nix
+++ b/pkgs/applications/misc/roxterm/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, docbook_xsl, dbus, dbus-glib, expat
-, gsettings-desktop-schemas, gdk_pixbuf, gtk3, hicolor-icon-theme
+, gsettings-desktop-schemas, gdk-pixbuf, gtk3, hicolor-icon-theme
 , imagemagick, itstool, librsvg, libtool, libxslt, makeWrapper
 , pkgconfig, python, pythonPackages, vte
 , wrapGAppsHook}:
@@ -23,7 +23,7 @@ in stdenv.mkDerivation rec {
   buildInputs =
     [ docbook_xsl expat imagemagick itstool librsvg libtool libxslt
       makeWrapper python pythonPackages.lockfile dbus dbus-glib
-      gdk_pixbuf gsettings-desktop-schemas gtk3
+      gdk-pixbuf gsettings-desktop-schemas gtk3
       hicolor-icon-theme vte ];
 
   NIX_CFLAGS_COMPILE = [ "-I${dbus-glib.dev}/include/dbus-1.0"
diff --git a/pkgs/applications/misc/rxvt_unicode/default.nix b/pkgs/applications/misc/rxvt_unicode/default.nix
index d198c5951359..053eaf6e54c7 100644
--- a/pkgs/applications/misc/rxvt_unicode/default.nix
+++ b/pkgs/applications/misc/rxvt_unicode/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, makeDesktopItem, perlSupport ? true, libX11, libXt, libXft,
   ncurses, perl, fontconfig, freetype, pkgconfig, libXrender,
-  gdkPixbufSupport ? true, gdk_pixbuf, unicode3Support ? true }:
+  gdkPixbufSupport ? true, gdk-pixbuf, unicode3Support ? true }:
 
 let
   pname = "rxvt-unicode";
@@ -31,7 +31,7 @@ stdenv.mkDerivation (rec {
     [ libX11 libXt libXft ncurses /* required to build the terminfo file */
       fontconfig freetype pkgconfig libXrender ]
     ++ stdenv.lib.optional perlSupport perl
-    ++ stdenv.lib.optional gdkPixbufSupport gdk_pixbuf;
+    ++ stdenv.lib.optional gdkPixbufSupport gdk-pixbuf;
 
   outputs = [ "out" "terminfo" ];
 
diff --git a/pkgs/applications/misc/safeeyes/default.nix b/pkgs/applications/misc/safeeyes/default.nix
index de1e7a093d5a..30f54cdee7e9 100644
--- a/pkgs/applications/misc/safeeyes/default.nix
+++ b/pkgs/applications/misc/safeeyes/default.nix
@@ -1,4 +1,4 @@
-{ lib, python3Packages, gobject-introspection, libappindicator-gtk3, libnotify, gtk3, gnome3, xprintidle-ng, wrapGAppsHook, gdk_pixbuf, shared-mime-info, librsvg
+{ lib, python3Packages, gobject-introspection, libappindicator-gtk3, libnotify, gtk3, gnome3, xprintidle-ng, wrapGAppsHook, gdk-pixbuf, shared-mime-info, librsvg
 }:
 
 let inherit (python3Packages) python buildPythonApplication fetchPypi;
@@ -50,7 +50,7 @@ in buildPythonApplication rec {
 
   preFixup = ''
     gappsWrapperArgs+=(
-      --prefix XDG_DATA_DIRS : "${gdk_pixbuf}/share"
+      --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
       --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"
       --prefix XDG_DATA_DIRS : "${librsvg}/share"
 
diff --git a/pkgs/applications/misc/simplenote/default.nix b/pkgs/applications/misc/simplenote/default.nix
index 719b8d32b330..6a16741a06b5 100644
--- a/pkgs/applications/misc/simplenote/default.nix
+++ b/pkgs/applications/misc/simplenote/default.nix
@@ -1,5 +1,5 @@
 { fetchurl, stdenv, lib, zlib, glib, alsaLib, dbus, gtk2, atk, pango, freetype, fontconfig
-, libgnome-keyring3, gdk_pixbuf, cairo, cups, expat, libgpgerror, nspr
+, libgnome-keyring3, gdk-pixbuf, cairo, cups, expat, libgpgerror, nspr
 , nss, xorg, libcap, systemd, libnotify ,libXScrnSaver, gnome2 }:
 
 stdenv.mkDerivation rec {
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
 
     packages = [
       stdenv.cc.cc zlib glib dbus gtk2 atk pango freetype libgnome-keyring3
-      fontconfig gdk_pixbuf cairo cups expat libgpgerror alsaLib nspr nss
+      fontconfig gdk-pixbuf cairo cups expat libgpgerror alsaLib nspr nss
       xorg.libXrender xorg.libX11 xorg.libXext xorg.libXdamage xorg.libXtst
       xorg.libXcomposite xorg.libXi xorg.libXfixes xorg.libXrandr
       xorg.libXcursor libcap systemd libnotify libXScrnSaver gnome2.GConf
diff --git a/pkgs/applications/misc/stretchly/default.nix b/pkgs/applications/misc/stretchly/default.nix
index 8f26ee99e227..213f308646ab 100644
--- a/pkgs/applications/misc/stretchly/default.nix
+++ b/pkgs/applications/misc/stretchly/default.nix
@@ -8,7 +8,7 @@
 , expat
 , fetchurl
 , fontconfig
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gtk2
 , gtk3
@@ -51,7 +51,7 @@ let
     dbus
     expat
     fontconfig
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk2
     gtk3
diff --git a/pkgs/applications/misc/terminus/default.nix b/pkgs/applications/misc/terminus/default.nix
index c12a4c9f8da6..8518b72bc95f 100644
--- a/pkgs/applications/misc/terminus/default.nix
+++ b/pkgs/applications/misc/terminus/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, dpkg, gnome2, gtk2, atk, glib, pango, gdk_pixbuf, cairo
+{ stdenv, lib, fetchurl, dpkg, gnome2, gtk2, atk, glib, pango, gdk-pixbuf, cairo
 , freetype, fontconfig, dbus, libXi, libXcursor, libXdamage, libXrandr
 , libXcomposite, libXext, libXfixes, libXrender, libX11, libXtst, libXScrnSaver
 , libxcb, makeWrapper, nodejs
@@ -6,7 +6,7 @@
 
 let
   libPath = stdenv.lib.makeLibraryPath [
-    stdenv.cc.cc gtk2 atk glib pango gdk_pixbuf cairo freetype fontconfig dbus
+    stdenv.cc.cc gtk2 atk glib pango gdk-pixbuf cairo freetype fontconfig dbus
     libXi libXcursor libXdamage libXrandr libXcomposite libXext libXfixes libxcb
     libXrender libX11 libXtst libXScrnSaver gnome2.GConf nss nspr alsaLib cups expat systemd libpulseaudio
   ];
diff --git a/pkgs/applications/misc/volnoti/default.nix b/pkgs/applications/misc/volnoti/default.nix
index 166811fb4ae3..47b0385be687 100644
--- a/pkgs/applications/misc/volnoti/default.nix
+++ b/pkgs/applications/misc/volnoti/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, fetchpatch
-, pkgconfig, dbus, gdk_pixbuf, glib, libX11, gtk2, librsvg
+, pkgconfig, dbus, gdk-pixbuf, glib, libX11, gtk2, librsvg
 , dbus-glib, autoreconfHook, wrapGAppsHook }:
 
 stdenv.mkDerivation rec {
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig autoreconfHook wrapGAppsHook ];
 
   buildInputs = [
-    dbus gdk_pixbuf glib libX11 gtk2 dbus-glib librsvg
+    dbus gdk-pixbuf glib libX11 gtk2 dbus-glib librsvg
   ];
 
   meta = with stdenv.lib; {
diff --git a/pkgs/applications/misc/xneur/default.nix b/pkgs/applications/misc/xneur/default.nix
index c6438a21f2c3..1cce7b155fde 100644
--- a/pkgs/applications/misc/xneur/default.nix
+++ b/pkgs/applications/misc/xneur/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, intltool, xorg, pcre, gst_all_1, glib
-, xosd, libnotify, enchant, wrapGAppsHook, gdk_pixbuf }:
+, xosd, libnotify, enchant, wrapGAppsHook, gdk-pixbuf }:
 
 stdenv.mkDerivation rec {
    name = "xneur-${version}";
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     xorg.libX11 xorg.libXtst pcre gst_all_1.gstreamer glib
     xosd xorg.libXext xorg.libXi libnotify
-    enchant gdk_pixbuf
+    enchant gdk-pixbuf
     gst_all_1.gst-plugins-base gst_all_1.gst-plugins-good
   ];
 
diff --git a/pkgs/applications/misc/xxkb/default.nix b/pkgs/applications/misc/xxkb/default.nix
index 56638d126c19..db952758f04c 100644
--- a/pkgs/applications/misc/xxkb/default.nix
+++ b/pkgs/applications/misc/xxkb/default.nix
@@ -1,9 +1,9 @@
 { stdenv, fetchurl, libX11, libXt, libXext, libXpm, imake, gccmakedep
-, svgSupport ? false, librsvg, glib, gdk_pixbuf, pkgconfig
+, svgSupport ? false, librsvg, glib, gdk-pixbuf, pkgconfig
 }:
 
 assert svgSupport ->
-  librsvg != null && glib != null && gdk_pixbuf != null && pkgconfig != null;
+  librsvg != null && glib != null && gdk-pixbuf != null && pkgconfig != null;
 
 stdenv.mkDerivation rec {
   name = "xxkb-1.11.1";
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ imake gccmakedep ];
   buildInputs = [
     libX11 libXt libXext libXpm
-  ] ++ stdenv.lib.optionals svgSupport [ librsvg glib gdk_pixbuf pkgconfig ];
+  ] ++ stdenv.lib.optionals svgSupport [ librsvg glib gdk-pixbuf pkgconfig ];
 
   outputs = [ "out" "man" ];
 
diff --git a/pkgs/applications/networking/browsers/brave/default.nix b/pkgs/applications/networking/browsers/brave/default.nix
index 4a6af3f96b44..3603e1605f94 100644
--- a/pkgs/applications/networking/browsers/brave/default.nix
+++ b/pkgs/applications/networking/browsers/brave/default.nix
@@ -10,7 +10,7 @@
 , expat
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gnome2
 , gnome3
@@ -52,7 +52,7 @@ rpath = lib.makeLibraryPath [
   expat
   fontconfig
   freetype
-  gdk_pixbuf
+  gdk-pixbuf
   glib
   gnome2.GConf
   gtk3
diff --git a/pkgs/applications/networking/browsers/firefox-bin/default.nix b/pkgs/applications/networking/browsers/firefox-bin/default.nix
index c52bf0ba95e1..2f79f6900cd9 100644
--- a/pkgs/applications/networking/browsers/firefox-bin/default.nix
+++ b/pkgs/applications/networking/browsers/firefox-bin/default.nix
@@ -9,7 +9,7 @@
 , fontconfig
 , freetype
 , gconf
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , glibc
 , gtk2
@@ -104,7 +104,7 @@ stdenv.mkDerivation {
       fontconfig
       freetype
       gconf
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       glibc
       gtk2
diff --git a/pkgs/applications/networking/browsers/google-chrome/default.nix b/pkgs/applications/networking/browsers/google-chrome/default.nix
index b0ae61c761df..977b40e4a7e3 100644
--- a/pkgs/applications/networking/browsers/google-chrome/default.nix
+++ b/pkgs/applications/networking/browsers/google-chrome/default.nix
@@ -4,7 +4,7 @@
 , glib, fontconfig, freetype, pango, cairo, libX11, libXi, atk, gconf, nss, nspr
 , libXcursor, libXext, libXfixes, libXrender, libXScrnSaver, libXcomposite, libxcb
 , alsaLib, libXdamage, libXtst, libXrandr, expat, cups
-, dbus, gtk2, gtk3, gdk_pixbuf, gcc-unwrapped, at-spi2-atk, at-spi2-core
+, dbus, gtk2, gtk3, gdk-pixbuf, gcc-unwrapped, at-spi2-atk, at-spi2-core
 , kerberos
 
 # command line arguments which are always set e.g "--disable-gpu"
@@ -52,7 +52,7 @@ let
     glib fontconfig freetype pango cairo libX11 libXi atk gconf nss nspr
     libXcursor libXext libXfixes libXrender libXScrnSaver libXcomposite libxcb
     alsaLib libXdamage libXtst libXrandr expat cups
-    dbus gdk_pixbuf gcc-unwrapped.lib
+    dbus gdk-pixbuf gcc-unwrapped.lib
     systemd
     libexif
     liberation_ttf curl utillinux xdg_utils wget
diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/bluejeans/default.nix b/pkgs/applications/networking/browsers/mozilla-plugins/bluejeans/default.nix
index fa98f2a9e785..32e4366a4e46 100644
--- a/pkgs/applications/networking/browsers/mozilla-plugins/bluejeans/default.nix
+++ b/pkgs/applications/networking/browsers/mozilla-plugins/bluejeans/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, xorg, gtk2, glib, gdk_pixbuf, dpkg, libXext, libXfixes
+{ stdenv, fetchurl, xorg, gtk2, glib, gdk-pixbuf, dpkg, libXext, libXfixes
 , libXrender, libuuid, libXrandr, libXcomposite, libpulseaudio
 }:
 
@@ -10,7 +10,7 @@ let
     [gtk2 glib stdenv.cc.cc];
 
   rpathPlugin = makeLibraryPath
-    ([ stdenv.cc.cc gtk2 glib xorg.libX11 gdk_pixbuf libXext libXfixes libXrender libXrandr libXcomposite libpulseaudio ] ++ optional (libuuid != null) libuuid);
+    ([ stdenv.cc.cc gtk2 glib xorg.libX11 gdk-pixbuf libXext libXfixes libXrender libXrandr libXcomposite libpulseaudio ] ++ optional (libuuid != null) libuuid);
 
 in
 
diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/default.nix b/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/default.nix
index b4d0b91deac6..8aa51366e474 100644
--- a/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/default.nix
+++ b/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/default.nix
@@ -9,7 +9,7 @@
 , expat
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , glibc
 , graphite2
@@ -130,7 +130,7 @@ stdenv.mkDerivation rec {
 
   rpath = lib.makeLibraryPath
     [ stdenv.cc.cc
-      alsaLib atk bzip2 cairo curl expat fontconfig freetype gdk_pixbuf glib
+      alsaLib atk bzip2 cairo curl expat fontconfig freetype gdk-pixbuf glib
       glibc graphite2 gtk2 harfbuzz libICE libSM libX11 libXau libXcomposite
       libXcursor libXdamage libXdmcp libXext libXfixes libXi libXinerama
       libXrandr libXrender libXt libXxf86vm libdrm libffi libglvnd libpng
diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/standalone.nix b/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/standalone.nix
index 585c0be26d1d..c9081ee3d69b 100644
--- a/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/standalone.nix
+++ b/pkgs/applications/networking/browsers/mozilla-plugins/flashplayer/standalone.nix
@@ -9,7 +9,7 @@
 , expat
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , glibc
 , graphite2
@@ -86,7 +86,7 @@ stdenv.mkDerivation rec {
 
   rpath = lib.makeLibraryPath
     [ stdenv.cc.cc
-      alsaLib atk bzip2 cairo curl expat fontconfig freetype gdk_pixbuf glib
+      alsaLib atk bzip2 cairo curl expat fontconfig freetype gdk-pixbuf glib
       glibc graphite2 gtk2 harfbuzz libICE libSM libX11 libXau libXcomposite
       libXcursor libXdamage libXdmcp libXext libXfixes libXi libXinerama
       libXrandr libXrender libXt libXxf86vm libdrm libffi libglvnd libpng
diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/google-talk-plugin/default.nix b/pkgs/applications/networking/browsers/mozilla-plugins/google-talk-plugin/default.nix
index 71b5161c1e39..8a25036c70a3 100644
--- a/pkgs/applications/networking/browsers/mozilla-plugins/google-talk-plugin/default.nix
+++ b/pkgs/applications/networking/browsers/mozilla-plugins/google-talk-plugin/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, libGL, xorg, cairo
-, libpng, gtk2, glib, gdk_pixbuf, fontconfig, freetype, curl
+, libpng, gtk2, glib, gdk-pixbuf, fontconfig, freetype, curl
 , dbus-glib, alsaLib, libpulseaudio, systemd, pango
 }:
 
@@ -24,7 +24,7 @@ let
     ];
 
   rpathProgram = makeLibraryPath
-    [ gdk_pixbuf
+    [ gdk-pixbuf
       glib
       gtk2
       xorg.libX11
diff --git a/pkgs/applications/networking/browsers/opera/default.nix b/pkgs/applications/networking/browsers/opera/default.nix
index 732e020604a8..062d2e6582b1 100644
--- a/pkgs/applications/networking/browsers/opera/default.nix
+++ b/pkgs/applications/networking/browsers/opera/default.nix
@@ -9,7 +9,7 @@
 , fetchurl
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gnome2
 , gtk3
@@ -55,7 +55,7 @@ let
     expat.out
     fontconfig.lib
     freetype.out
-    gdk_pixbuf.out
+    gdk-pixbuf.out
     glib.out
     gnome2.GConf
     gtk3.out
diff --git a/pkgs/applications/networking/browsers/tor-browser-bundle-bin/default.nix b/pkgs/applications/networking/browsers/tor-browser-bundle-bin/default.nix
index 4eeb65826721..6632b116fc35 100644
--- a/pkgs/applications/networking/browsers/tor-browser-bundle-bin/default.nix
+++ b/pkgs/applications/networking/browsers/tor-browser-bundle-bin/default.nix
@@ -12,7 +12,7 @@
 , dbus-glib
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gtk3
 , libxcb
@@ -67,7 +67,7 @@ let
     dbus-glib
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk3
     libxcb
diff --git a/pkgs/applications/networking/browsers/vivaldi/default.nix b/pkgs/applications/networking/browsers/vivaldi/default.nix
index 4b0071bfabc1..2367c0a98553 100644
--- a/pkgs/applications/networking/browsers/vivaldi/default.nix
+++ b/pkgs/applications/networking/browsers/vivaldi/default.nix
@@ -4,7 +4,7 @@
 , freetype, fontconfig, libXft, libXrender, libxcb, expat
 , libuuid
 , gstreamer, gst-plugins-base, libxml2
-, glib, gtk3, pango, gdk_pixbuf, cairo, atk, at-spi2-atk, at-spi2-core, gnome2
+, glib, gtk3, pango, gdk-pixbuf, cairo, atk, at-spi2-atk, at-spi2-core, gnome2
 , nss, nspr
 , patchelf, makeWrapper
 , isSnapshot ? false
@@ -34,7 +34,7 @@ in stdenv.mkDerivation rec {
   buildInputs = [
     stdenv.cc.cc stdenv.cc.libc zlib libX11 libXt libXext libSM libICE libxcb
     libXi libXft libXcursor libXfixes libXScrnSaver libXcomposite libXdamage libXtst libXrandr
-    atk at-spi2-atk at-spi2-core alsaLib dbus cups gtk3 gdk_pixbuf libexif ffmpeg systemd
+    atk at-spi2-atk at-spi2-core alsaLib dbus cups gtk3 gdk-pixbuf libexif ffmpeg systemd
     freetype fontconfig libXrender libuuid expat glib nss nspr
     gstreamer libxml2 gst-plugins-base pango cairo gnome2.GConf
   ] ++ stdenv.lib.optional proprietaryCodecs vivaldi-ffmpeg-codecs;
diff --git a/pkgs/applications/networking/dropbox/cli.nix b/pkgs/applications/networking/dropbox/cli.nix
index 2b6645b2c8a6..ae0643669dc0 100644
--- a/pkgs/applications/networking/dropbox/cli.nix
+++ b/pkgs/applications/networking/dropbox/cli.nix
@@ -6,7 +6,7 @@
 , dropbox
 , gtk3
 , gnome3
-, gdk_pixbuf
+, gdk-pixbuf
 , gobject-introspection
 }:
 
@@ -36,7 +36,7 @@ stdenv.mkDerivation {
   nativeBuildInputs = [
     pkgconfig
     gobject-introspection
-    gdk_pixbuf
+    gdk-pixbuf
     # only for build, the install command also wants to use GTK through introspection
     # but we are using Nix for installation so we will not need that.
     (python3.withPackages (ps: with ps; [
diff --git a/pkgs/applications/networking/instant-messengers/bluejeans/default.nix b/pkgs/applications/networking/instant-messengers/bluejeans/default.nix
index a2ba2f09f764..fb38255ea382 100644
--- a/pkgs/applications/networking/instant-messengers/bluejeans/default.nix
+++ b/pkgs/applications/networking/instant-messengers/bluejeans/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, rpmextract, patchelf, libnotify, libcap, cairo, pango, fontconfig, udev, dbus
-, gtk2, atk, expat, gdk_pixbuf, freetype, nspr, glib, nss, gconf, libX11, libXrender, libXtst, libXdamage
+, gtk2, atk, expat, gdk-pixbuf, freetype, nspr, glib, nss, gconf, libX11, libXrender, libXtst, libXdamage
 , libXi, libXext, libXfixes, libXcomposite, alsaLib, bash
 }:
 
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   libPath =
     stdenv.lib.makeLibraryPath
-       [ libnotify libcap cairo pango fontconfig gtk2 atk expat gdk_pixbuf dbus udev.lib
+       [ libnotify libcap cairo pango fontconfig gtk2 atk expat gdk-pixbuf dbus udev.lib
          freetype nspr glib stdenv.cc stdenv.cc.cc.lib nss gconf libX11 libXrender libXtst libXdamage
          libXi libXext libXfixes libXcomposite alsaLib
        ];
diff --git a/pkgs/applications/networking/instant-messengers/coyim/default.nix b/pkgs/applications/networking/instant-messengers/coyim/default.nix
index e2e94db089da..fb47d8db8c85 100644
--- a/pkgs/applications/networking/instant-messengers/coyim/default.nix
+++ b/pkgs/applications/networking/instant-messengers/coyim/default.nix
@@ -1,5 +1,5 @@
 { stdenv, buildGoPackage, fetchFromGitHub, pkgconfig,
-  cairo, gdk_pixbuf, glib, gnome3, wrapGAppsHook, gtk3 }:
+  cairo, gdk-pixbuf, glib, gnome3, wrapGAppsHook, gtk3 }:
 
 buildGoPackage rec {
   name = "coyim-${version}";
@@ -14,7 +14,7 @@ buildGoPackage rec {
     sha256 = "1g8nf56j17rdhhj7pv3ha1rb2mfc0mdvyzl35pgcki08w7iw08j3";
   };
 
-  nativeBuildInputs = [ pkgconfig wrapGAppsHook glib cairo gdk_pixbuf gtk3 gnome3.adwaita-icon-theme ];
+  nativeBuildInputs = [ pkgconfig wrapGAppsHook glib cairo gdk-pixbuf gtk3 gnome3.adwaita-icon-theme ];
 
   meta = with stdenv.lib; {
     description = "a safe and secure chat client";
diff --git a/pkgs/applications/networking/instant-messengers/dino/default.nix b/pkgs/applications/networking/instant-messengers/dino/default.nix
index 7c2b312c4b34..2158409471f9 100644
--- a/pkgs/applications/networking/instant-messengers/dino/default.nix
+++ b/pkgs/applications/networking/instant-messengers/dino/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub
 , vala, cmake, ninja, wrapGAppsHook, pkgconfig, gettext
-, gobject-introspection, gnome3, glib, gdk_pixbuf, gtk3, glib-networking
+, gobject-introspection, gnome3, glib, gdk-pixbuf, gtk3, glib-networking
 , xorg, libXdmcp, libxkbcommon
 , libnotify, libsoup, libgee
 , libgcrypt
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     libgee
     gnome3.adwaita-icon-theme
     sqlite
-    gdk_pixbuf
+    gdk-pixbuf
     gtk3
     libnotify
     gpgme
diff --git a/pkgs/applications/networking/instant-messengers/discord/base.nix b/pkgs/applications/networking/instant-messengers/discord/base.nix
index 17f6f4773741..4dadcb6ce232 100644
--- a/pkgs/applications/networking/instant-messengers/discord/base.nix
+++ b/pkgs/applications/networking/instant-messengers/discord/base.nix
@@ -1,7 +1,7 @@
 { pname, version, src, binaryName, desktopName
 , stdenv, fetchurl, makeDesktopItem, wrapGAppsHook
 , alsaLib, atk, at-spi2-atk, at-spi2-core, cairo, cups, dbus, expat, fontconfig, freetype
-, gdk_pixbuf, glib, gtk3, libnotify, libX11, libXcomposite, libXcursor, libXdamage, libuuid
+, gdk-pixbuf, glib, gtk3, libnotify, libX11, libXcomposite, libXcursor, libXdamage, libuuid
 , libXext, libXfixes, libXi, libXrandr, libXrender, libXtst, nspr, nss, libxcb
 , pango, systemd, libXScrnSaver, libcxx, libpulseaudio }:
 
@@ -17,7 +17,7 @@ in stdenv.mkDerivation rec {
   libPath = stdenv.lib.makeLibraryPath [
     libcxx systemd libpulseaudio
     stdenv.cc.cc alsaLib atk at-spi2-atk at-spi2-core cairo cups dbus expat fontconfig freetype
-    gdk_pixbuf glib gtk3 libnotify libX11 libXcomposite libuuid
+    gdk-pixbuf glib gtk3 libnotify libX11 libXcomposite libuuid
     libXcursor libXdamage libXext libXfixes libXi libXrandr libXrender
     libXtst nspr nss libxcb pango systemd libXScrnSaver
    ];
diff --git a/pkgs/applications/networking/instant-messengers/franz/default.nix b/pkgs/applications/networking/instant-messengers/franz/default.nix
index 63624146aeb8..9db5f30033d4 100644
--- a/pkgs/applications/networking/instant-messengers/franz/default.nix
+++ b/pkgs/applications/networking/instant-messengers/franz/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, makeWrapper, wrapGAppsHook, autoPatchelfHook, dpkg
-, xorg, atk, glib, pango, gdk_pixbuf, cairo, freetype, fontconfig, gtk3
+, xorg, atk, glib, pango, gdk-pixbuf, cairo, freetype, fontconfig, gtk3
 , gnome2, dbus, nss, nspr, alsaLib, cups, expat, udev, libnotify, xdg_utils }:
 
 let
@@ -19,7 +19,7 @@ in stdenv.mkDerivation rec {
     libXi libXcursor libXdamage libXrandr libXcomposite libXext libXfixes
     libXrender libX11 libXtst libXScrnSaver
   ]) ++ [
-    gtk3 atk glib pango gdk_pixbuf cairo freetype fontconfig dbus
+    gtk3 atk glib pango gdk-pixbuf cairo freetype fontconfig dbus
     gnome2.GConf nss nspr alsaLib cups expat stdenv.cc.cc
   ];
   runtimeDependencies = [ udev.lib libnotify ];
diff --git a/pkgs/applications/networking/instant-messengers/gitter/default.nix b/pkgs/applications/networking/instant-messengers/gitter/default.nix
index 5b664415c1f8..6878c9a870b1 100644
--- a/pkgs/applications/networking/instant-messengers/gitter/default.nix
+++ b/pkgs/applications/networking/instant-messengers/gitter/default.nix
@@ -1,5 +1,5 @@
 { stdenv, alsaLib, atk, cairo, cups, dbus, dpkg, expat, fetchurl
-, fontconfig, freetype, gdk_pixbuf, glib, gnome2, gtk3, libX11
+, fontconfig, freetype, gdk-pixbuf, glib, gnome2, gtk3, libX11
 , libXScrnSaver, libXcomposite, libXcursor, libXdamage, libXext, libXfixes
 , libXi, libXrandr, libXrender, libXtst, libappindicator-gtk3, libcxx
 , libnotify, libpulseaudio, libxcb, makeDesktopItem, makeWrapper, nspr, nss
@@ -12,7 +12,7 @@ let gitterDirectorySuffix = "opt/gitter";
          $out/${gitterDirectorySuffix}/${target}
        '';
    libPath = stdenv.lib.makeLibraryPath [
-     alsaLib atk cairo cups dbus expat fontconfig freetype gdk_pixbuf glib
+     alsaLib atk cairo cups dbus expat fontconfig freetype gdk-pixbuf glib
      gnome2.GConf gtk3 libX11 libXScrnSaver libXcomposite libXcursor libXdamage
      libXext libXfixes libXi libXrandr libXrender libXtst libappindicator-gtk3
      libcxx libnotify libpulseaudio libxcb nspr nss pango stdenv.cc.cc systemd
diff --git a/pkgs/applications/networking/instant-messengers/linphone/default.nix b/pkgs/applications/networking/instant-messengers/linphone/default.nix
index 4282e99a712e..67d5e56a021f 100644
--- a/pkgs/applications/networking/instant-messengers/linphone/default.nix
+++ b/pkgs/applications/networking/instant-messengers/linphone/default.nix
@@ -2,7 +2,7 @@
 , zlib, libxml2, gtk2, libnotify, speex, ffmpeg, libX11, libsoup, udev
 , ortp, mediastreamer, sqlite, belle-sip, libosip, libexosip, bzrtp
 , mediastreamer-openh264, bctoolbox, makeWrapper, fetchFromGitHub, cmake
-, libmatroska, bcunit, doxygen, gdk_pixbuf, glib, cairo, pango, polarssl
+, libmatroska, bcunit, doxygen, gdk-pixbuf, glib, cairo, pango, polarssl
 , python, graphviz, belcard
 , withGui ? true
 }:
@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     readline openldap cyrus_sasl libupnp zlib libxml2 gtk2 libnotify speex ffmpeg libX11
     polarssl libsoup udev ortp mediastreamer sqlite belle-sip libosip libexosip
-    bctoolbox libmatroska bcunit gdk_pixbuf glib cairo pango bzrtp belcard
+    bctoolbox libmatroska bcunit gdk-pixbuf glib cairo pango bzrtp belcard
   ];
 
   nativeBuildInputs = [
diff --git a/pkgs/applications/networking/instant-messengers/mattermost-desktop/default.nix b/pkgs/applications/networking/instant-messengers/mattermost-desktop/default.nix
index e8c28dc3e536..1fb743148118 100644
--- a/pkgs/applications/networking/instant-messengers/mattermost-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/mattermost-desktop/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, gnome2, gtk3, pango, atk, cairo, gdk_pixbuf, glib,
+{ stdenv, fetchurl, gnome2, gtk3, pango, atk, cairo, gdk-pixbuf, glib,
 freetype, fontconfig, dbus, libX11, xorg, libXi, libXcursor, libXdamage,
 libXrandr, libXcomposite, libXext, libXfixes, libXrender, libXtst,
 libXScrnSaver, nss, nspr, alsaLib, cups, expat, udev }:
@@ -12,7 +12,7 @@ let
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gtk3
diff --git a/pkgs/applications/networking/instant-messengers/pidgin-plugins/skype4pidgin/default.nix b/pkgs/applications/networking/instant-messengers/pidgin-plugins/skype4pidgin/default.nix
index ddb9217d5e22..6657ff96b11f 100644
--- a/pkgs/applications/networking/instant-messengers/pidgin-plugins/skype4pidgin/default.nix
+++ b/pkgs/applications/networking/instant-messengers/pidgin-plugins/skype4pidgin/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, pidgin, libnotify, gdk_pixbuf, glib, dbus
+{ stdenv, fetchurl, pkgconfig, pidgin, libnotify, gdk-pixbuf, glib, dbus
 , dbus-glib }:
 
 stdenv.mkDerivation rec {
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
   postInstall = "ln -s \$out/lib/pidgin \$out/share/pidgin-otr";
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ pidgin libnotify gdk_pixbuf glib dbus dbus-glib ];
+  buildInputs = [ pidgin libnotify gdk-pixbuf glib dbus dbus-glib ];
 
   meta = {
     homepage = https://github.com/novas0x2a/skype4pidgin;
diff --git a/pkgs/applications/networking/instant-messengers/profanity/default.nix b/pkgs/applications/networking/instant-messengers/profanity/default.nix
index 1273c7dd3c3d..fbbf62049715 100644
--- a/pkgs/applications/networking/instant-messengers/profanity/default.nix
+++ b/pkgs/applications/networking/instant-messengers/profanity/default.nix
@@ -4,14 +4,14 @@
 , autoconf-archive
 
 , autoAwaySupport ? true,       libXScrnSaver ? null, libX11 ? null
-, notifySupport ? true,         libnotify ? null, gdk_pixbuf ? null
+, notifySupport ? true,         libnotify ? null, gdk-pixbuf ? null
 , traySupport ? true,           gnome2 ? null
 , pgpSupport ? true,            gpgme ? null
 , pythonPluginSupport ? true,   python ? null
 }:
 
 assert autoAwaySupport     -> libXScrnSaver != null && libX11 != null;
-assert notifySupport       -> libnotify != null && gdk_pixbuf != null;
+assert notifySupport       -> libnotify != null && gdk-pixbuf != null;
 assert traySupport         -> gnome2 != null;
 assert pgpSupport          -> gpgme != null;
 assert pythonPluginSupport -> python != null;
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
     expect readline libuuid glib openssl expat ncurses libotr
     curl libmesode cmocka libmicrohttpd stabber
   ] ++ optionals autoAwaySupport     [ libXScrnSaver libX11 ]
-    ++ optionals notifySupport       [ libnotify gdk_pixbuf ]
+    ++ optionals notifySupport       [ libnotify gdk-pixbuf ]
     ++ optionals traySupport         [ gnome2.gtk ]
     ++ optionals pgpSupport          [ gpgme ]
     ++ optionals pythonPluginSupport [ python ];
diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
index e0cb977d5c2b..fa72d234ce9b 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchurl, dpkg, wrapGAppsHook
-, gnome2, gtk3, atk, at-spi2-atk, cairo, pango, gdk_pixbuf, glib, freetype, fontconfig
+, gnome2, gtk3, atk, at-spi2-atk, cairo, pango, gdk-pixbuf, glib, freetype, fontconfig
 , dbus, libX11, xorg, libXi, libXcursor, libXdamage, libXrandr, libXcomposite
 , libXext, libXfixes, libXrender, libXtst, libXScrnSaver, nss, nspr, alsaLib
 , cups, expat, udev, libnotify, libuuid
@@ -31,7 +31,7 @@ let
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gtk3
diff --git a/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix b/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
index 8a732de08ce7..59db08a35aca 100644
--- a/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
+++ b/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, dpkg
-, alsaLib, atk, cairo, cups, curl, dbus, expat, fontconfig, freetype, gdk_pixbuf, glib, glibc, gnome2, gnome3
+, alsaLib, atk, cairo, cups, curl, dbus, expat, fontconfig, freetype, gdk-pixbuf, glib, glibc, gnome2, gnome3
 , gtk3, libnotify, libpulseaudio, libsecret, libv4l, nspr, nss, pango, systemd, wrapGAppsHook, xorg
 , at-spi2-atk }:
 
@@ -25,7 +25,7 @@ let
     libsecret
 
     gnome2.GConf
-    gdk_pixbuf
+    gdk-pixbuf
     gtk3
 
     gnome3.gnome-keyring
diff --git a/pkgs/applications/networking/instant-messengers/slack/default.nix b/pkgs/applications/networking/instant-messengers/slack/default.nix
index 309b09f10c49..8b74cbc4d937 100644
--- a/pkgs/applications/networking/instant-messengers/slack/default.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/default.nix
@@ -1,5 +1,5 @@
 { theme ? null, stdenv, fetchurl, dpkg, makeWrapper , alsaLib, atk, cairo,
-cups, curl, dbus, expat, fontconfig, freetype, glib , gnome2, gtk3, gdk_pixbuf,
+cups, curl, dbus, expat, fontconfig, freetype, glib , gnome2, gtk3, gdk-pixbuf,
 libappindicator-gtk3, libnotify, libxcb, nspr, nss, pango , systemd, xorg,
 at-spi2-atk, libuuid
 }:
@@ -21,7 +21,7 @@ let
     freetype
     glib
     gnome2.GConf
-    gdk_pixbuf
+    gdk-pixbuf
     gtk3
     pango
     libnotify
diff --git a/pkgs/applications/networking/instant-messengers/stride/default.nix b/pkgs/applications/networking/instant-messengers/stride/default.nix
index 9df816dd8907..17a38479f82e 100644
--- a/pkgs/applications/networking/instant-messengers/stride/default.nix
+++ b/pkgs/applications/networking/instant-messengers/stride/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, dpkg, alsaLib, atk, cairo, cups, dbus, expat, fontconfig
-, freetype, gdk_pixbuf, glib, gnome2, nspr, nss, pango, udev, xorg }:
+, freetype, gdk-pixbuf, glib, gnome2, nspr, nss, pango, udev, xorg }:
 let
   fullPath = stdenv.lib.makeLibraryPath [
     alsaLib
@@ -10,7 +10,7 @@ let
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gnome2.gtk
diff --git a/pkgs/applications/networking/instant-messengers/toxic/default.nix b/pkgs/applications/networking/instant-messengers/toxic/default.nix
index c4acb22c810c..95879fef05ad 100644
--- a/pkgs/applications/networking/instant-messengers/toxic/default.nix
+++ b/pkgs/applications/networking/instant-messengers/toxic/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, libsodium, ncurses, curl
 , libtoxcore, openal, libvpx, freealut, libconfig, pkgconfig, libopus
-, qrencode, gdk_pixbuf, libnotify }:
+, qrencode, gdk-pixbuf, libnotify }:
 
 stdenv.mkDerivation rec {
   name = "toxic-${version}";
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   installFlags = [ "PREFIX=$(out)"];
 
   buildInputs = [
-    libtoxcore libsodium ncurses curl gdk_pixbuf libnotify
+    libtoxcore libsodium ncurses curl gdk-pixbuf libnotify
   ] ++ stdenv.lib.optionals (!stdenv.isAarch32) [
     openal libopus libvpx freealut qrencode
   ];
diff --git a/pkgs/applications/networking/instant-messengers/wire-desktop/default.nix b/pkgs/applications/networking/instant-messengers/wire-desktop/default.nix
index f2ae27e2c7da..fb8a24be70d2 100644
--- a/pkgs/applications/networking/instant-messengers/wire-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/wire-desktop/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, dpkg, makeDesktopItem, libuuid, gtk3, atk, cairo, pango
-, gdk_pixbuf, glib, freetype, fontconfig, dbus, libnotify, libX11, xorg, libXi
+, gdk-pixbuf, glib, freetype, fontconfig, dbus, libnotify, libX11, xorg, libXi
 , libXcursor, libXdamage, libXrandr, libXcomposite, libXext, libXfixes
 , libXrender, libXtst, libXScrnSaver, nss, nspr, alsaLib, cups, expat, udev
 , xdg_utils, hunspell, pulseaudio, pciutils, at-spi2-atk
@@ -16,7 +16,7 @@ let
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk3
     at-spi2-atk
diff --git a/pkgs/applications/networking/mailreaders/inboxer/default.nix b/pkgs/applications/networking/mailreaders/inboxer/default.nix
index 72b9ce09d76d..4139b650fb78 100644
--- a/pkgs/applications/networking/mailreaders/inboxer/default.nix
+++ b/pkgs/applications/networking/mailreaders/inboxer/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, binutils, patchelf, makeWrapper
-, expat, xorg, gdk_pixbuf, glib, gnome2, cairo, atk, freetype
+, expat, xorg, gdk-pixbuf, glib, gnome2, cairo, atk, freetype
 , fontconfig, dbus, nss, nspr, gtk2-x11, alsaLib, cups, libpulseaudio, udev }:
 
 stdenv.mkDerivation rec {
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
       xorg.libXtst
       xorg.libXScrnSaver
       xorg.libxcb
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       gnome2.pango
       gnome2.GConf
diff --git a/pkgs/applications/networking/mailreaders/mailnag/default.nix b/pkgs/applications/networking/mailreaders/mailnag/default.nix
index 32455e1132fd..d81513406624 100644
--- a/pkgs/applications/networking/mailreaders/mailnag/default.nix
+++ b/pkgs/applications/networking/mailreaders/mailnag/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, gettext, gtk3, pythonPackages
-, gdk_pixbuf, libnotify, gst_all_1
+, gdk-pixbuf, libnotify, gst_all_1
 , libgnome-keyring3
 , wrapGAppsHook, gnome3
 # otherwise passwords are stored unencrypted
@@ -18,7 +18,7 @@ in pythonPackages.buildPythonApplication rec {
   };
 
   buildInputs = [
-    gtk3 gdk_pixbuf libnotify gst_all_1.gstreamer
+    gtk3 gdk-pixbuf libnotify gst_all_1.gstreamer
     gst_all_1.gst-plugins-base gst_all_1.gst-plugins-good
     gst_all_1.gst-plugins-bad
     gnome3.adwaita-icon-theme
diff --git a/pkgs/applications/networking/mailreaders/nylas-mail-bin/default.nix b/pkgs/applications/networking/mailreaders/nylas-mail-bin/default.nix
index 3d8673a87a1b..5bb24c9ded7e 100644
--- a/pkgs/applications/networking/mailreaders/nylas-mail-bin/default.nix
+++ b/pkgs/applications/networking/mailreaders/nylas-mail-bin/default.nix
@@ -10,7 +10,7 @@
 , fontconfig
 , freetype
 , gcc-unwrapped
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gnome2
 , libgnome-keyring
@@ -53,7 +53,7 @@ stdenv.mkDerivation rec {
     fontconfig
     freetype
     gcc-unwrapped
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gnome2.gtk
diff --git a/pkgs/applications/networking/mailreaders/thunderbird-bin/default.nix b/pkgs/applications/networking/mailreaders/thunderbird-bin/default.nix
index 088233644791..5e005cd6669d 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird-bin/default.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird-bin/default.nix
@@ -10,7 +10,7 @@
 , dbus
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , glibc
 , gst-plugins-base
@@ -90,7 +90,7 @@ stdenv.mkDerivation {
       dbus
       fontconfig
       freetype
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       glibc
       gst-plugins-base
diff --git a/pkgs/applications/networking/mullvad-vpn/default.nix b/pkgs/applications/networking/mullvad-vpn/default.nix
index 2d5f47ee9826..2cbf83c16aee 100644
--- a/pkgs/applications/networking/mullvad-vpn/default.nix
+++ b/pkgs/applications/networking/mullvad-vpn/default.nix
@@ -1,6 +1,6 @@
 { stdenv, makeWrapper, fetchurl, dpkg
 , alsaLib, atk, cairo, cups, dbus, expat, fontconfig, freetype
-, gdk_pixbuf, glib, gnome2, pango, nspr, nss, gtk3
+, gdk-pixbuf, glib, gnome2, pango, nspr, nss, gtk3
 , xorg, autoPatchelfHook, systemd, libnotify
 }:
 
@@ -13,7 +13,7 @@ let deps = [
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     pango
diff --git a/pkgs/applications/networking/p2p/tixati/default.nix b/pkgs/applications/networking/p2p/tixati/default.nix
index 7a5f389af248..ea8b5c3a11f6 100644
--- a/pkgs/applications/networking/p2p/tixati/default.nix
+++ b/pkgs/applications/networking/p2p/tixati/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, glib, zlib, dbus, dbus-glib, gtk2, gdk_pixbuf, cairo, pango }:
+{ stdenv, fetchurl, glib, zlib, dbus, dbus-glib, gtk2, gdk-pixbuf, cairo, pango }:
 
 stdenv.mkDerivation rec {
   name = "tixati-${version}";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
-             --set-rpath ${stdenv.lib.makeLibraryPath [ glib zlib dbus dbus-glib gtk2 gdk_pixbuf cairo pango ]} \
+             --set-rpath ${stdenv.lib.makeLibraryPath [ glib zlib dbus dbus-glib gtk2 gdk-pixbuf cairo pango ]} \
              tixati
     install -D tixati         $out/bin/tixati
     install -D tixati.desktop $out/share/applications/tixati.desktop
diff --git a/pkgs/applications/networking/p2p/transgui/default.nix b/pkgs/applications/networking/p2p/transgui/default.nix
index d4823988526e..7c720cf35a02 100644
--- a/pkgs/applications/networking/p2p/transgui/default.nix
+++ b/pkgs/applications/networking/p2p/transgui/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, pkgconfig, makeDesktopItem, unzip, fpc, lazarus,
-libX11, glib, gtk2, gdk_pixbuf, pango, atk, cairo, openssl }:
+libX11, glib, gtk2, gdk-pixbuf, pango, atk, cairo, openssl }:
 
 stdenv.mkDerivation rec {
   pname = "transgui";
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
     unzip fpc lazarus stdenv.cc
-    libX11 glib gtk2 gdk_pixbuf pango atk cairo openssl
+    libX11 glib gtk2 gdk-pixbuf pango atk cairo openssl
   ];
 
   NIX_LDFLAGS = "
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
     "INSTALL_PREFIX=$(out)"
   ];
 
-  LCL_PLATFORM = "gtk2"; 
+  LCL_PLATFORM = "gtk2";
 
   desktopItem = makeDesktopItem rec {
     name = "transgui";
@@ -63,10 +63,10 @@ stdenv.mkDerivation rec {
     mkdir -p "$out/share/icons/hicolor/48x48/apps"
     cp transgui.png "$out/share/icons/hicolor/48x48/apps"
     mkdir -p "$out/share/transgui"
-    cp -r "./lang" "$out/share/transgui" 
+    cp -r "./lang" "$out/share/transgui"
   '';
 
-  meta = { 
+  meta = {
     description = "A cross platform front-end for the Transmission Bit-Torrent client";
     homepage = https://sourceforge.net/p/transgui;
     license = stdenv.lib.licenses.gpl2Plus;
diff --git a/pkgs/applications/networking/remote/anydesk/default.nix b/pkgs/applications/networking/remote/anydesk/default.nix
index a9b358fc7937..66edc2032762 100644
--- a/pkgs/applications/networking/remote/anydesk/default.nix
+++ b/pkgs/applications/networking/remote/anydesk/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, makeWrapper, makeDesktopItem
-, atk, cairo, gdk_pixbuf, glib, gnome2, gtk2, libGLU_combined, pango, xorg
+, atk, cairo, gdk-pixbuf, glib, gnome2, gtk2, libGLU_combined, pango, xorg
 , lsb-release, freetype, fontconfig, pangox_compat, polkit, polkit_gnome }:
 
 let
@@ -35,7 +35,7 @@ in stdenv.mkDerivation rec {
   };
 
   buildInputs = [
-    atk cairo gdk_pixbuf glib gtk2 stdenv.cc.cc pango
+    atk cairo gdk-pixbuf glib gtk2 stdenv.cc.cc pango
     gnome2.gtkglext libGLU_combined freetype fontconfig
     pangox_compat polkit polkit_gnome
   ] ++ (with xorg; [
diff --git a/pkgs/applications/networking/remote/citrix-receiver/default.nix b/pkgs/applications/networking/remote/citrix-receiver/default.nix
index d6e25ae4e7b5..1f70cb56b54f 100644
--- a/pkgs/applications/networking/remote/citrix-receiver/default.nix
+++ b/pkgs/applications/networking/remote/citrix-receiver/default.nix
@@ -12,7 +12,7 @@
 , glib
 , gtk2
 , atk
-, gdk_pixbuf
+, gdk-pixbuf
 , cairo
 , pango
 , gnome3
@@ -100,14 +100,14 @@ let
         busybox
         file
         gtk2
-        gdk_pixbuf
+        gdk-pixbuf
       ];
 
       libPath = stdenv.lib.makeLibraryPath [
         glib
         gtk2
         atk
-        gdk_pixbuf
+        gdk-pixbuf
         cairo
         pango
         gnome3.dconf
diff --git a/pkgs/applications/networking/remote/citrix-workspace/default.nix b/pkgs/applications/networking/remote/citrix-workspace/default.nix
index 13a16a6e2245..4598903d2016 100644
--- a/pkgs/applications/networking/remote/citrix-workspace/default.nix
+++ b/pkgs/applications/networking/remote/citrix-workspace/default.nix
@@ -12,7 +12,7 @@
 , glib
 , gtk2
 , atk
-, gdk_pixbuf
+, gdk-pixbuf
 , cairo
 , pango
 , gnome3
@@ -100,14 +100,14 @@ let
         busybox
         file
         gtk2
-        gdk_pixbuf
+        gdk-pixbuf
       ];
 
       libPath = stdenv.lib.makeLibraryPath [
         glib
         gtk2
         atk
-        gdk_pixbuf
+        gdk-pixbuf
         cairo
         pango
         gnome3.dconf
diff --git a/pkgs/applications/networking/ssb/patchwork-classic/default.nix b/pkgs/applications/networking/ssb/patchwork-classic/default.nix
index 1f8d0cba6d05..706dd6703248 100644
--- a/pkgs/applications/networking/ssb/patchwork-classic/default.nix
+++ b/pkgs/applications/networking/ssb/patchwork-classic/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, lib, makeWrapper,
   # build dependencies
   alsaLib, atk, cairo, cups, dbus, expat, fontconfig,
-  freetype, gdk_pixbuf, glib, gnome2, nspr, nss, xorg,
+  freetype, gdk-pixbuf, glib, gnome2, nspr, nss, xorg,
   glibc, systemd
 }:
 
@@ -50,7 +50,7 @@ stdenv.mkDerivation rec {
       expat
       fontconfig
       freetype
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       gnome2.GConf
       gnome2.gtk
@@ -99,7 +99,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Electron wrapper for Patchwork Classic: run as a desktop app outside the browser";
     homepage    = "https://github.com/ssbc/patchwork-classic-electron";
-    license     = licenses.gpl3; 
+    license     = licenses.gpl3;
     maintainers = with maintainers; [ mrVanDalo ];
     platforms   = platforms.linux;
   };
diff --git a/pkgs/applications/networking/super-productivity/default.nix b/pkgs/applications/networking/super-productivity/default.nix
index 9bb4254c64a2..3f87c8558e1f 100644
--- a/pkgs/applications/networking/super-productivity/default.nix
+++ b/pkgs/applications/networking/super-productivity/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, dpkg, makeWrapper
 , alsaLib, atk, cairo, cups, curl, dbus, expat, fontconfig, freetype, glib
-, gnome2, gtk3, gdk_pixbuf, libnotify, libxcb, nspr, nss, pango
+, gnome2, gtk3, gdk-pixbuf, libnotify, libxcb, nspr, nss, pango
 , systemd, xorg, xprintidle-ng }:
 
 let
@@ -19,7 +19,7 @@ let
     freetype
     glib
     gnome2.GConf
-    gdk_pixbuf
+    gdk-pixbuf
     gtk3
     pango
     libnotify
diff --git a/pkgs/applications/office/moneyplex/default.nix b/pkgs/applications/office/moneyplex/default.nix
index ad621303d7d3..3e666b0f6272 100644
--- a/pkgs/applications/office/moneyplex/default.nix
+++ b/pkgs/applications/office/moneyplex/default.nix
@@ -1,10 +1,10 @@
 { stdenv, fetchurl, patchelf, coreutils, pcsclite
-, zlib, glib, gdk_pixbuf, gtk2, cairo, pango, libX11, atk, openssl
+, zlib, glib, gdk-pixbuf, gtk2, cairo, pango, libX11, atk, openssl
 , runtimeShell }:
 
 let
   libPath = stdenv.lib.makeLibraryPath [
-    stdenv.cc.cc zlib glib gdk_pixbuf gtk2 cairo pango libX11 atk openssl
+    stdenv.cc.cc zlib glib gdk-pixbuf gtk2 cairo pango libX11 atk openssl
   ];
 
   src_i686 = {
diff --git a/pkgs/applications/office/pinpoint/default.nix b/pkgs/applications/office/pinpoint/default.nix
index 680b3fd40d72..7e6da96db808 100644
--- a/pkgs/applications/office/pinpoint/default.nix
+++ b/pkgs/applications/office/pinpoint/default.nix
@@ -1,5 +1,5 @@
 { fetchurl, stdenv, pkgconfig, autoconf, automake, clutter, clutter-gst
-, gdk_pixbuf, cairo, clutter-gtk }:
+, gdk-pixbuf, cairo, clutter-gtk }:
 
 stdenv.mkDerivation rec {
   name = "pinpoint-${version}";
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "1jp8chr9vjlpb5lybwp5cg6g90ak5jdzz9baiqkbg0anlg8ps82s";
   };
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ autoconf automake clutter clutter-gst gdk_pixbuf
+  buildInputs = [ autoconf automake clutter clutter-gst gdk-pixbuf
                   cairo clutter-gtk ];
 
   meta = with stdenv.lib; {
diff --git a/pkgs/applications/office/spice-up/default.nix b/pkgs/applications/office/spice-up/default.nix
index a99ac7e44b78..2c3dfa82c8c2 100644
--- a/pkgs/applications/office/spice-up/default.nix
+++ b/pkgs/applications/office/spice-up/default.nix
@@ -1,7 +1,7 @@
 { stdenv
 , fetchFromGitHub
 , cmake
-, gdk_pixbuf
+, gdk-pixbuf
 , gtk3
 , gettext
 , ninja
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     pantheon.elementary-icon-theme
     pantheon.granite
-    gdk_pixbuf
+    gdk-pixbuf
     gtk3
     json-glib
     libevdev
diff --git a/pkgs/applications/office/zotero/default.nix b/pkgs/applications/office/zotero/default.nix
index 86eb0ab4c381..3d4f98ddd44f 100644
--- a/pkgs/applications/office/zotero/default.nix
+++ b/pkgs/applications/office/zotero/default.nix
@@ -7,7 +7,7 @@
 , dbus
 , fontconfig
 , freetype
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , glibc
 , gtk3
@@ -35,12 +35,12 @@
 stdenv.mkDerivation rec {
   name    = "zotero-${version}";
   version = "5.0.71";
-  
+
   src = fetchurl {
     url = "https://download.zotero.org/client/release/${version}/Zotero-${version}_linux-x86_64.tar.bz2";
     sha256 = "070b1ak870jv8h702a9g930p01jsmly93c44igw48ylbgqjyhlwq";
   };
-  
+
   buildInputs= [ wrapGAppsHook gsettings-desktop-schemas gtk3 gnome3.adwaita-icon-theme gnome3.dconf ];
 
   phases = [ "unpackPhase" "patchPhase" "installPhase" "fixupPhase" ];
@@ -58,7 +58,7 @@ stdenv.mkDerivation rec {
       dbus
       fontconfig
       freetype
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       glibc
       gtk3
diff --git a/pkgs/applications/science/electronics/bitscope/common.nix b/pkgs/applications/science/electronics/bitscope/common.nix
index 64777b5a0ac8..9101f1fdbe5e 100644
--- a/pkgs/applications/science/electronics/bitscope/common.nix
+++ b/pkgs/applications/science/electronics/bitscope/common.nix
@@ -2,7 +2,7 @@
 , buildFHSUserEnv
 , cairo
 , dpkg
-, gdk_pixbuf
+, gdk-pixbuf
 , glib
 , gtk2-x11
 , makeWrapper
@@ -39,7 +39,7 @@ let
     libs = attrs.libs or [
       atk
       cairo
-      gdk_pixbuf
+      gdk-pixbuf
       glib
       gtk2-x11
       pango
diff --git a/pkgs/applications/science/logic/verifast/default.nix b/pkgs/applications/science/logic/verifast/default.nix
index 22eb5d07f1c1..360f75cc6f07 100644
--- a/pkgs/applications/science/logic/verifast/default.nix
+++ b/pkgs/applications/science/logic/verifast/default.nix
@@ -1,10 +1,10 @@
-{ stdenv, fetchurl, gtk2, gdk_pixbuf, atk, pango, glib, cairo, freetype
+{ stdenv, fetchurl, gtk2, gdk-pixbuf, atk, pango, glib, cairo, freetype
 , fontconfig, libxml2, gnome2 }:
 
 let
 
   libPath = stdenv.lib.makeLibraryPath
-    [ stdenv.cc.libc stdenv.cc.cc gtk2 gdk_pixbuf atk pango glib cairo
+    [ stdenv.cc.libc stdenv.cc.cc gtk2 gdk-pixbuf atk pango glib cairo
       freetype fontconfig libxml2 gnome2.gtksourceview
     ] + ":${stdenv.cc.cc.lib}/lib64:$out/libexec";
 
diff --git a/pkgs/applications/version-management/gitkraken/default.nix b/pkgs/applications/version-management/gitkraken/default.nix
index 12d22e2cc3ca..ffca24ab27d1 100644
--- a/pkgs/applications/version-management/gitkraken/default.nix
+++ b/pkgs/applications/version-management/gitkraken/default.nix
@@ -1,7 +1,7 @@
 { stdenv, libXcomposite, libgnome-keyring, makeWrapper, udev, curl, alsaLib
 , libXfixes, atk, gtk3, libXrender, pango, gnome2, gnome3, cairo, freetype, fontconfig
 , libX11, libXi, libxcb, libXext, libXcursor, glib, libXScrnSaver, libxkbfile, libXtst
-, nss, nspr, cups, fetchurl, expat, gdk_pixbuf, libXdamage, libXrandr, dbus
+, nss, nspr, cups, fetchurl, expat, gdk-pixbuf, libXdamage, libXrandr, dbus
 , dpkg, makeDesktopItem, openssl, wrapGAppsHook, hicolor-icon-theme, at-spi2-atk, libuuid
 }:
 
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
     cups
     alsaLib
     expat
-    gdk_pixbuf
+    gdk-pixbuf
     dbus
     libXdamage
     libXrandr
diff --git a/pkgs/applications/video/devede/default.nix b/pkgs/applications/video/devede/default.nix
index 4802d259fb23..d614523f5345 100644
--- a/pkgs/applications/video/devede/default.nix
+++ b/pkgs/applications/video/devede/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, python3Packages, ffmpeg, mplayer, vcdimager, cdrkit, dvdauthor
-, gtk3, gettext, wrapGAppsHook, gdk_pixbuf, gobject-introspection }:
+, gtk3, gettext, wrapGAppsHook, gdk-pixbuf, gobject-introspection }:
 
 let
   inherit (python3Packages) dbus-python buildPythonApplication pygobject3 urllib3;
@@ -34,7 +34,7 @@ in buildPythonApplication rec {
   ];
 
   propagatedBuildInputs = [
-    gtk3 pygobject3 gdk_pixbuf dbus-python ffmpeg mplayer dvdauthor vcdimager cdrkit urllib3
+    gtk3 pygobject3 gdk-pixbuf dbus-python ffmpeg mplayer dvdauthor vcdimager cdrkit urllib3
   ];
 
   postPatch = ''
diff --git a/pkgs/applications/video/lightworks/default.nix b/pkgs/applications/video/lightworks/default.nix
index 6d74c64343d8..b4d4312c0fac 100644
--- a/pkgs/applications/video/lightworks/default.nix
+++ b/pkgs/applications/video/lightworks/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, dpkg, makeWrapper, buildFHSUserEnv
-, gtk3, gdk_pixbuf, cairo, libjpeg_original, glib, gnome2, libGLU
+, gtk3, gdk-pixbuf, cairo, libjpeg_original, glib, gnome2, libGLU
 , nvidia_cg_toolkit, zlib, openssl, portaudio
 }:
 let
   fullPath = stdenv.lib.makeLibraryPath [
     stdenv.cc.cc
     gtk3
-    gdk_pixbuf
+    gdk-pixbuf
     cairo
     libjpeg_original
     glib
@@ -60,7 +60,7 @@ let
       wrapProgram $out/lib/lightworks/ntcardvt \
         --prefix LD_LIBRARY_PATH : ${fullPath}:$out/lib/lightworks \
         --set FONTCONFIG_FILE $out/lib/lightworks/fonts.conf
-       
+
       cp -r usr/share $out/share
     '';
 
diff --git a/pkgs/applications/video/webtorrent_desktop/default.nix b/pkgs/applications/video/webtorrent_desktop/default.nix
index 086190000ab4..0c28b4d57372 100644
--- a/pkgs/applications/video/webtorrent_desktop/default.nix
+++ b/pkgs/applications/video/webtorrent_desktop/default.nix
@@ -1,6 +1,6 @@
 {
   alsaLib, atk, cairo, cups, dbus, dpkg, expat, fetchurl, fontconfig, freetype,
-  gdk_pixbuf, glib, gnome2, libX11, libXScrnSaver, libXcomposite, libXcursor,
+  gdk-pixbuf, glib, gnome2, libX11, libXScrnSaver, libXcomposite, libXcursor,
   libXdamage, libXext, libXfixes, libXi, libXrandr, libXrender, libXtst,
   libxcb, nspr, nss, stdenv, udev
 }:
@@ -15,7 +15,7 @@
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gnome2.gtk
diff --git a/pkgs/applications/window-managers/awesome/default.nix b/pkgs/applications/window-managers/awesome/default.nix
index 25438c816055..5c897926432e 100644
--- a/pkgs/applications/window-managers/awesome/default.nix
+++ b/pkgs/applications/window-managers/awesome/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, luaPackages, cairo, librsvg, cmake, imagemagick, pkgconfig, gdk_pixbuf
+{ stdenv, fetchFromGitHub, luaPackages, cairo, librsvg, cmake, imagemagick, pkgconfig, gdk-pixbuf
 , xorg, libstartup_notification, libxdg_basedir, libpthreadstubs
 , xcb-util-cursor, makeWrapper, pango, gobject-introspection
 , which, dbus, nettools, git, doxygen
@@ -40,7 +40,7 @@ with luaPackages; stdenv.mkDerivation rec {
   FONTCONFIG_FILE = toString fontsConf;
 
   propagatedUserEnvPkgs = [ hicolor-icon-theme ];
-  buildInputs = [ cairo librsvg dbus gdk_pixbuf gobject-introspection
+  buildInputs = [ cairo librsvg dbus gdk-pixbuf gobject-introspection
                   git lgi libpthreadstubs libstartup_notification
                   libxdg_basedir lua nettools pango xcb-util-cursor
                   xorg.libXau xorg.libXdmcp xorg.libxcb xorg.libxshmfence
diff --git a/pkgs/applications/window-managers/dwm/dwm-status.nix b/pkgs/applications/window-managers/dwm/dwm-status.nix
index 734d70598fb0..5ffd94e9f872 100644
--- a/pkgs/applications/window-managers/dwm/dwm-status.nix
+++ b/pkgs/applications/window-managers/dwm/dwm-status.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, rustPlatform, fetchFromGitHub, dbus, gdk_pixbuf, libnotify, makeWrapper, pkgconfig, xorg
+{ stdenv, lib, rustPlatform, fetchFromGitHub, dbus, gdk-pixbuf, libnotify, makeWrapper, pkgconfig, xorg
 , enableAlsaUtils ? true, alsaUtils, coreutils
 , enableNetwork ? true, dnsutils, iproute, wirelesstools }:
 
@@ -19,7 +19,7 @@ rustPlatform.buildRustPackage rec {
   };
 
   nativeBuildInputs = [ makeWrapper pkgconfig ];
-  buildInputs = [ dbus gdk_pixbuf libnotify xorg.libX11 ];
+  buildInputs = [ dbus gdk-pixbuf libnotify xorg.libX11 ];
 
   cargoSha256 = "1r2wczfkdpvjc7iylwajkminraaz1ix6n724in0dvv5klfcdxlxb";
 
diff --git a/pkgs/applications/window-managers/icewm/default.nix b/pkgs/applications/window-managers/icewm/default.nix
index 8406736541c0..2f6199122f14 100644
--- a/pkgs/applications/window-managers/icewm/default.nix
+++ b/pkgs/applications/window-managers/icewm/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, cmake, gettext
 , libjpeg, libtiff, libungif, libpng, imlib, expat
-, freetype, fontconfig, pkgconfig, gdk_pixbuf
+, freetype, fontconfig, pkgconfig, gdk-pixbuf
 , mkfontdir, libX11, libXft, libXext, libXinerama
 , libXrandr, libICE, libSM, libXpm, libXdmcp, libxcb
 , libpthreadstubs, pcre }:
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   buildInputs =
   [ cmake gettext libjpeg libtiff libungif libpng imlib expat
-    freetype fontconfig pkgconfig gdk_pixbuf mkfontdir libX11
+    freetype fontconfig pkgconfig gdk-pixbuf mkfontdir libX11
     libXft libXext libXinerama libXrandr libICE libSM libXpm
     libXdmcp libxcb libpthreadstubs pcre ];
 
diff --git a/pkgs/applications/window-managers/sawfish/default.nix b/pkgs/applications/window-managers/sawfish/default.nix
index 887a58b748da..d8bb58c21b66 100644
--- a/pkgs/applications/window-managers/sawfish/default.nix
+++ b/pkgs/applications/window-managers/sawfish/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl
 , pkgconfig, which, autoreconfHook
-, rep-gtk, pango, gdk_pixbuf
+, rep-gtk, pango, gdk-pixbuf
 , imlib, gettext, texinfo
 , libXinerama, libXrandr, libXtst, libICE, libSM
 , makeWrapper
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
   buildInputs = [ which
-    rep-gtk pango gdk_pixbuf imlib gettext texinfo
+    rep-gtk pango gdk-pixbuf imlib gettext texinfo
     libXinerama libXrandr libXtst libICE libSM
     makeWrapper ];
 
diff --git a/pkgs/applications/window-managers/sway/bg.nix b/pkgs/applications/window-managers/sway/bg.nix
index d68cacf666fe..595197a3f6f0 100644
--- a/pkgs/applications/window-managers/sway/bg.nix
+++ b/pkgs/applications/window-managers/sway/bg.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub
 , meson, ninja, pkgconfig, scdoc
-, wayland, wayland-protocols, cairo, gdk_pixbuf
+, wayland, wayland-protocols, cairo, gdk-pixbuf
 }:
 
 stdenv.mkDerivation rec {
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ meson ninja pkgconfig scdoc ];
-  buildInputs = [ wayland wayland-protocols cairo gdk_pixbuf ];
+  buildInputs = [ wayland wayland-protocols cairo gdk-pixbuf ];
 
   mesonFlags = [
     "-Dgdk-pixbuf=enabled" "-Dman-pages=enabled"
diff --git a/pkgs/applications/window-managers/sway/default.nix b/pkgs/applications/window-managers/sway/default.nix
index 7d5c4c05131d..12427b912654 100644
--- a/pkgs/applications/window-managers/sway/default.nix
+++ b/pkgs/applications/window-managers/sway/default.nix
@@ -2,7 +2,7 @@
 , meson, ninja
 , pkgconfig, scdoc
 , wayland, libxkbcommon, pcre, json_c, dbus, libevdev
-, pango, cairo, libinput, libcap, pam, gdk_pixbuf
+, pango, cairo, libinput, libcap, pam, gdk-pixbuf
 , wlroots, wayland-protocols, swaybg
 }:
 
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     wayland libxkbcommon pcre json_c dbus libevdev
-    pango cairo libinput libcap pam gdk_pixbuf
+    pango cairo libinput libcap pam gdk-pixbuf
     wlroots wayland-protocols
   ];
 
diff --git a/pkgs/applications/window-managers/sway/lock.nix b/pkgs/applications/window-managers/sway/lock.nix
index a7505e141688..80d6ed4e0729 100644
--- a/pkgs/applications/window-managers/sway/lock.nix
+++ b/pkgs/applications/window-managers/sway/lock.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub
 , meson, ninja, pkgconfig, scdoc
-, wayland, wayland-protocols, libxkbcommon, cairo, gdk_pixbuf, pam
+, wayland, wayland-protocols, libxkbcommon, cairo, gdk-pixbuf, pam
 }:
 
 stdenv.mkDerivation rec {
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
   '';
 
   nativeBuildInputs = [ meson ninja pkgconfig scdoc ];
-  buildInputs = [ wayland wayland-protocols libxkbcommon cairo gdk_pixbuf pam ];
+  buildInputs = [ wayland wayland-protocols libxkbcommon cairo gdk-pixbuf pam ];
 
   mesonFlags = [
     "-Dpam=enabled" "-Dgdk-pixbuf=enabled" "-Dman-pages=enabled"
diff --git a/pkgs/applications/window-managers/trayer/default.nix b/pkgs/applications/window-managers/trayer/default.nix
index 5aec0973a7c6..5705ae8256c8 100644
--- a/pkgs/applications/window-managers/trayer/default.nix
+++ b/pkgs/applications/window-managers/trayer/default.nix
@@ -1,10 +1,10 @@
-{ stdenv, fetchFromGitHub, pkgconfig, gdk_pixbuf, gtk2 }:
+{ stdenv, fetchFromGitHub, pkgconfig, gdk-pixbuf, gtk2 }:
 
 stdenv.mkDerivation rec {
   name = "trayer-1.1.8";
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ gdk_pixbuf gtk2 ];
+  buildInputs = [ gdk-pixbuf gtk2 ];
 
   src = fetchFromGitHub {
     owner = "sargon";
diff --git a/pkgs/applications/window-managers/way-cooler/crates-io.nix b/pkgs/applications/window-managers/way-cooler/crates-io.nix
index 9dbd367a67f3..29e256401919 100644
--- a/pkgs/applications/window-managers/way-cooler/crates-io.nix
+++ b/pkgs/applications/window-managers/way-cooler/crates-io.nix
@@ -546,76 +546,76 @@ rec {
 # end
 # gdk-pixbuf-0.2.0
 
-  crates.gdk_pixbuf."0.2.0" = deps: { features?(features_.gdk_pixbuf."0.2.0" deps {}) }: buildRustCrate {
+  crates.gdk-pixbuf."0.2.0" = deps: { features?(features_.gdk-pixbuf."0.2.0" deps {}) }: buildRustCrate {
     crateName = "gdk-pixbuf";
     version = "0.2.0";
     authors = [ "The Gtk-rs Project Developers" ];
     sha256 = "082z1s30haa59ax35wsv06mj8z8bhhq0fac36g01qa77kpiphj5y";
-    libName = "gdk_pixbuf";
+    libName = "gdk-pixbuf";
     build = "build.rs";
     dependencies = mapFeatures features ([
-      (crates."gdk_pixbuf_sys"."${deps."gdk_pixbuf"."0.2.0"."gdk_pixbuf_sys"}" deps)
-      (crates."glib"."${deps."gdk_pixbuf"."0.2.0"."glib"}" deps)
-      (crates."glib_sys"."${deps."gdk_pixbuf"."0.2.0"."glib_sys"}" deps)
-      (crates."gobject_sys"."${deps."gdk_pixbuf"."0.2.0"."gobject_sys"}" deps)
-      (crates."libc"."${deps."gdk_pixbuf"."0.2.0"."libc"}" deps)
+      (crates."gdk_pixbuf_sys"."${deps."gdk-pixbuf"."0.2.0"."gdk_pixbuf_sys"}" deps)
+      (crates."glib"."${deps."gdk-pixbuf"."0.2.0"."glib"}" deps)
+      (crates."glib_sys"."${deps."gdk-pixbuf"."0.2.0"."glib_sys"}" deps)
+      (crates."gobject_sys"."${deps."gdk-pixbuf"."0.2.0"."gobject_sys"}" deps)
+      (crates."libc"."${deps."gdk-pixbuf"."0.2.0"."libc"}" deps)
     ]);
 
     buildDependencies = mapFeatures features ([
 ]);
-    features = mkFeatures (features."gdk_pixbuf"."0.2.0" or {});
+    features = mkFeatures (features."gdk-pixbuf"."0.2.0" or {});
   };
-  features_.gdk_pixbuf."0.2.0" = deps: f: updateFeatures f (rec {
-    gdk_pixbuf = fold recursiveUpdate {} [
-      { "0.2.0".default = (f.gdk_pixbuf."0.2.0".default or true); }
+  features_.gdk-pixbuf."0.2.0" = deps: f: updateFeatures f (rec {
+    gdk-pixbuf = fold recursiveUpdate {} [
+      { "0.2.0".default = (f.gdk-pixbuf."0.2.0".default or true); }
       { "0.2.0".gtk-rs-lgpl-docs =
-        (f.gdk_pixbuf."0.2.0".gtk-rs-lgpl-docs or false) ||
-        (f.gdk_pixbuf."0.2.0".embed-lgpl-docs or false) ||
-        (gdk_pixbuf."0.2.0"."embed-lgpl-docs" or false) ||
-        (f.gdk_pixbuf."0.2.0".purge-lgpl-docs or false) ||
-        (gdk_pixbuf."0.2.0"."purge-lgpl-docs" or false); }
+        (f.gdk-pixbuf."0.2.0".gtk-rs-lgpl-docs or false) ||
+        (f.gdk-pixbuf."0.2.0".embed-lgpl-docs or false) ||
+        (gdk-pixbuf."0.2.0"."embed-lgpl-docs" or false) ||
+        (f.gdk-pixbuf."0.2.0".purge-lgpl-docs or false) ||
+        (gdk-pixbuf."0.2.0"."purge-lgpl-docs" or false); }
       { "0.2.0".v2_28 =
-        (f.gdk_pixbuf."0.2.0".v2_28 or false) ||
-        (f.gdk_pixbuf."0.2.0".v2_30 or false) ||
-        (gdk_pixbuf."0.2.0"."v2_30" or false); }
+        (f.gdk-pixbuf."0.2.0".v2_28 or false) ||
+        (f.gdk-pixbuf."0.2.0".v2_30 or false) ||
+        (gdk-pixbuf."0.2.0"."v2_30" or false); }
       { "0.2.0".v2_30 =
-        (f.gdk_pixbuf."0.2.0".v2_30 or false) ||
-        (f.gdk_pixbuf."0.2.0".v2_32 or false) ||
-        (gdk_pixbuf."0.2.0"."v2_32" or false); }
+        (f.gdk-pixbuf."0.2.0".v2_30 or false) ||
+        (f.gdk-pixbuf."0.2.0".v2_32 or false) ||
+        (gdk-pixbuf."0.2.0"."v2_32" or false); }
       { "0.2.0".v2_32 =
-        (f.gdk_pixbuf."0.2.0".v2_32 or false) ||
-        (f.gdk_pixbuf."0.2.0".v2_36 or false) ||
-        (gdk_pixbuf."0.2.0"."v2_36" or false); }
+        (f.gdk-pixbuf."0.2.0".v2_32 or false) ||
+        (f.gdk-pixbuf."0.2.0".v2_36 or false) ||
+        (gdk-pixbuf."0.2.0"."v2_36" or false); }
     ];
     gdk_pixbuf_sys = fold recursiveUpdate {} [
-      { "${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_28" =
-        (f.gdk_pixbuf_sys."${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_28" or false) ||
-        (gdk_pixbuf."0.2.0"."v2_28" or false) ||
-        (f."gdk_pixbuf"."0.2.0"."v2_28" or false); }
-      { "${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_30" =
-        (f.gdk_pixbuf_sys."${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_30" or false) ||
-        (gdk_pixbuf."0.2.0"."v2_30" or false) ||
-        (f."gdk_pixbuf"."0.2.0"."v2_30" or false); }
-      { "${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_32" =
-        (f.gdk_pixbuf_sys."${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_32" or false) ||
-        (gdk_pixbuf."0.2.0"."v2_32" or false) ||
-        (f."gdk_pixbuf"."0.2.0"."v2_32" or false); }
-      { "${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_36" =
-        (f.gdk_pixbuf_sys."${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_36" or false) ||
-        (gdk_pixbuf."0.2.0"."v2_36" or false) ||
-        (f."gdk_pixbuf"."0.2.0"."v2_36" or false); }
-      { "${deps.gdk_pixbuf."0.2.0".gdk_pixbuf_sys}".default = true; }
+      { "${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_28" =
+        (f.gdk_pixbuf_sys."${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_28" or false) ||
+        (gdk-pixbuf."0.2.0"."v2_28" or false) ||
+        (f."gdk-pixbuf"."0.2.0"."v2_28" or false); }
+      { "${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_30" =
+        (f.gdk_pixbuf_sys."${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_30" or false) ||
+        (gdk-pixbuf."0.2.0"."v2_30" or false) ||
+        (f."gdk-pixbuf"."0.2.0"."v2_30" or false); }
+      { "${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_32" =
+        (f.gdk_pixbuf_sys."${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_32" or false) ||
+        (gdk-pixbuf."0.2.0"."v2_32" or false) ||
+        (f."gdk-pixbuf"."0.2.0"."v2_32" or false); }
+      { "${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_36" =
+        (f.gdk_pixbuf_sys."${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}"."v2_36" or false) ||
+        (gdk-pixbuf."0.2.0"."v2_36" or false) ||
+        (f."gdk-pixbuf"."0.2.0"."v2_36" or false); }
+      { "${deps.gdk-pixbuf."0.2.0".gdk_pixbuf_sys}".default = true; }
     ];
-    glib."${deps.gdk_pixbuf."0.2.0".glib}".default = true;
-    glib_sys."${deps.gdk_pixbuf."0.2.0".glib_sys}".default = true;
-    gobject_sys."${deps.gdk_pixbuf."0.2.0".gobject_sys}".default = true;
-    libc."${deps.gdk_pixbuf."0.2.0".libc}".default = true;
+    glib."${deps.gdk-pixbuf."0.2.0".glib}".default = true;
+    glib_sys."${deps.gdk-pixbuf."0.2.0".glib_sys}".default = true;
+    gobject_sys."${deps.gdk-pixbuf."0.2.0".gobject_sys}".default = true;
+    libc."${deps.gdk-pixbuf."0.2.0".libc}".default = true;
   }) [
-    (features_.gdk_pixbuf_sys."${deps."gdk_pixbuf"."0.2.0"."gdk_pixbuf_sys"}" deps)
-    (features_.glib."${deps."gdk_pixbuf"."0.2.0"."glib"}" deps)
-    (features_.glib_sys."${deps."gdk_pixbuf"."0.2.0"."glib_sys"}" deps)
-    (features_.gobject_sys."${deps."gdk_pixbuf"."0.2.0"."gobject_sys"}" deps)
-    (features_.libc."${deps."gdk_pixbuf"."0.2.0"."libc"}" deps)
+    (features_.gdk_pixbuf_sys."${deps."gdk-pixbuf"."0.2.0"."gdk_pixbuf_sys"}" deps)
+    (features_.glib."${deps."gdk-pixbuf"."0.2.0"."glib"}" deps)
+    (features_.glib_sys."${deps."gdk-pixbuf"."0.2.0"."glib_sys"}" deps)
+    (features_.gobject_sys."${deps."gdk-pixbuf"."0.2.0"."gobject_sys"}" deps)
+    (features_.libc."${deps."gdk-pixbuf"."0.2.0"."libc"}" deps)
   ];
 
 
@@ -2357,7 +2357,7 @@ rec {
       (crates."dbus"."${deps."way_cooler"."0.8.1"."dbus"}" deps)
       (crates."dbus_macros"."${deps."way_cooler"."0.8.1"."dbus_macros"}" deps)
       (crates."env_logger"."${deps."way_cooler"."0.8.1"."env_logger"}" deps)
-      (crates."gdk_pixbuf"."${deps."way_cooler"."0.8.1"."gdk_pixbuf"}" deps)
+      (crates."gdk-pixbuf"."${deps."way_cooler"."0.8.1"."gdk-pixbuf"}" deps)
       (crates."getopts"."${deps."way_cooler"."0.8.1"."getopts"}" deps)
       (crates."glib"."${deps."way_cooler"."0.8.1"."glib"}" deps)
       (crates."json_macro"."${deps."way_cooler"."0.8.1"."json_macro"}" deps)
@@ -2386,7 +2386,7 @@ rec {
     dbus."${deps.way_cooler."0.8.1".dbus}".default = true;
     dbus_macros."${deps.way_cooler."0.8.1".dbus_macros}".default = true;
     env_logger."${deps.way_cooler."0.8.1".env_logger}".default = true;
-    gdk_pixbuf."${deps.way_cooler."0.8.1".gdk_pixbuf}".default = true;
+    gdk-pixbuf."${deps.way_cooler."0.8.1".gdk-pixbuf}".default = true;
     getopts."${deps.way_cooler."0.8.1".getopts}".default = true;
     glib."${deps.way_cooler."0.8.1".glib}".default = true;
     json_macro."${deps.way_cooler."0.8.1".json_macro}".default = true;
@@ -2434,7 +2434,7 @@ rec {
     (features_.dbus."${deps."way_cooler"."0.8.1"."dbus"}" deps)
     (features_.dbus_macros."${deps."way_cooler"."0.8.1"."dbus_macros"}" deps)
     (features_.env_logger."${deps."way_cooler"."0.8.1"."env_logger"}" deps)
-    (features_.gdk_pixbuf."${deps."way_cooler"."0.8.1"."gdk_pixbuf"}" deps)
+    (features_.gdk-pixbuf."${deps."way_cooler"."0.8.1"."gdk-pixbuf"}" deps)
     (features_.getopts."${deps."way_cooler"."0.8.1"."getopts"}" deps)
     (features_.glib."${deps."way_cooler"."0.8.1"."glib"}" deps)
     (features_.json_macro."${deps."way_cooler"."0.8.1"."json_macro"}" deps)
diff --git a/pkgs/applications/window-managers/way-cooler/default.nix b/pkgs/applications/window-managers/way-cooler/default.nix
index 24320ff0073b..f06020143d78 100644
--- a/pkgs/applications/window-managers/way-cooler/default.nix
+++ b/pkgs/applications/window-managers/way-cooler/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, makeWrapper, symlinkJoin, writeShellScriptBin, callPackage, defaultCrateOverrides
-, wayland, wlc, cairo, libxkbcommon, pam, python3Packages, lemonbar, gdk_pixbuf
+, wayland, wlc, cairo, libxkbcommon, pam, python3Packages, lemonbar, gdk-pixbuf
 }:
 
 let
@@ -22,7 +22,7 @@ let
   way-cooler = ((way_cooler_ { builtin-lua = true; }).override {
     crateOverrides = defaultCrateOverrides // {
 
-    way-cooler = attrs: { buildInputs = [ wlc cairo libxkbcommon fakegit gdk_pixbuf wayland ]; };
+    way-cooler = attrs: { buildInputs = [ wlc cairo libxkbcommon fakegit gdk-pixbuf wayland ]; };
   };}).overrideAttrs (oldAttrs: rec {
     postBuild = ''
       mkdir -p $out/etc
diff --git a/pkgs/applications/window-managers/yabar/build.nix b/pkgs/applications/window-managers/yabar/build.nix
index 6fc1797dd251..678ebad75dd2 100644
--- a/pkgs/applications/window-managers/yabar/build.nix
+++ b/pkgs/applications/window-managers/yabar/build.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cairo, gdk_pixbuf, libconfig, pango, pkgconfig
+{ stdenv, fetchFromGitHub, cairo, gdk-pixbuf, libconfig, pango, pkgconfig
 , xcbutilwm, alsaLib, wirelesstools, asciidoc, libxslt, makeWrapper, docbook_xsl
 , configFile ? null, lib
 , rev, sha256, version, patches ? []
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
-    cairo gdk_pixbuf libconfig pango xcbutilwm docbook_xsl
+    cairo gdk-pixbuf libconfig pango xcbutilwm docbook_xsl
     alsaLib wirelesstools asciidoc libxslt makeWrapper
   ];
 
diff --git a/pkgs/build-support/appimage/default.nix b/pkgs/build-support/appimage/default.nix
index 990f1ce2e3e3..1f84403c10fc 100644
--- a/pkgs/build-support/appimage/default.nix
+++ b/pkgs/build-support/appimage/default.nix
@@ -97,7 +97,7 @@ rec {
       gtk2
       bzip2
       zlib
-      gdk_pixbuf
+      gdk-pixbuf
 
       xorg.libXinerama
       xorg.libXdamage
diff --git a/pkgs/build-support/rust/default-crate-overrides.nix b/pkgs/build-support/rust/default-crate-overrides.nix
index c0b1797f73f5..b3ab9f5ba780 100644
--- a/pkgs/build-support/rust/default-crate-overrides.nix
+++ b/pkgs/build-support/rust/default-crate-overrides.nix
@@ -1,5 +1,5 @@
 { stdenv, pkgconfig, curl, darwin, libiconv, libgit2, libssh2,
-  openssl, sqlite, zlib, dbus, dbus-glib, gdk_pixbuf, cairo, python3,
+  openssl, sqlite, zlib, dbus, dbus-glib, gdk-pixbuf, cairo, python3,
   libsodium, postgresql, gmp, foundationdb, ... }:
 
 let
@@ -62,7 +62,7 @@ in
   };
 
   gdk-pixbuf = attrs: {
-    buildInputs = [ gdk_pixbuf ];
+    buildInputs = [ gdk-pixbuf ];
   };
 
   libgit2-sys = attrs: {
diff --git a/pkgs/data/icons/elementary-xfce-icon-theme/default.nix b/pkgs/data/icons/elementary-xfce-icon-theme/default.nix
index d4a15a105cd3..4b42f0b6ee9f 100644
--- a/pkgs/data/icons/elementary-xfce-icon-theme/default.nix
+++ b/pkgs/data/icons/elementary-xfce-icon-theme/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, pkgconfig, gdk_pixbuf, optipng, librsvg, gtk3, hicolor-icon-theme }:
+{ stdenv, fetchFromGitHub, pkgconfig, gdk-pixbuf, optipng, librsvg, gtk3, hicolor-icon-theme }:
 
 stdenv.mkDerivation rec {
   name = "elementary-xfce-icon-theme-${version}";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "16msdrazhbv80cvh5ffvgj13xmkpf87r7mq6xz071fza6nv7g0jn";
   };
 
-  nativeBuildInputs = [ pkgconfig gdk_pixbuf librsvg optipng gtk3 hicolor-icon-theme ];
+  nativeBuildInputs = [ pkgconfig gdk-pixbuf librsvg optipng gtk3 hicolor-icon-theme ];
 
   postPatch = ''
     substituteInPlace svgtopng/Makefile --replace "-O0" "-O"
diff --git a/pkgs/data/themes/greybird/default.nix b/pkgs/data/themes/greybird/default.nix
index 02c8d2b64901..d573603ce903 100644
--- a/pkgs/data/themes/greybird/default.nix
+++ b/pkgs/data/themes/greybird/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, autoreconfHook, which, sassc, glib, libxml2, gdk_pixbuf, librsvg, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, autoreconfHook, which, sassc, glib, libxml2, gdk-pixbuf, librsvg, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   pname = "greybird";
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    gdk_pixbuf
+    gdk-pixbuf
     librsvg
   ];
 
diff --git a/pkgs/data/themes/matcha/default.nix b/pkgs/data/themes/matcha/default.nix
index 5a43511d532c..762ab3eac3e5 100644
--- a/pkgs/data/themes/matcha/default.nix
+++ b/pkgs/data/themes/matcha/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, gdk_pixbuf, librsvg, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, gdk-pixbuf, librsvg, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   name = "matcha-${version}";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1x954rmxv14xndn4ybhbr4pmzccnwqp462bpvzd2hak5wsqs4wxc";
   };
 
-  buildInputs = [ gdk_pixbuf librsvg ];
+  buildInputs = [ gdk-pixbuf librsvg ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/data/themes/materia-theme/default.nix b/pkgs/data/themes/materia-theme/default.nix
index 46b44d3ff90c..ccdd1067302e 100644
--- a/pkgs/data/themes/materia-theme/default.nix
+++ b/pkgs/data/themes/materia-theme/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, gnome3, glib, libxml2, gtk-engine-murrine, gdk_pixbuf, librsvg, bc }:
+{ stdenv, fetchFromGitHub, gnome3, glib, libxml2, gtk-engine-murrine, gdk-pixbuf, librsvg, bc }:
 
 stdenv.mkDerivation rec {
   pname = "materia-theme";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ glib libxml2 bc ];
 
-  buildInputs = [ gnome3.gnome-themes-extra gdk_pixbuf librsvg ];
+  buildInputs = [ gnome3.gnome-themes-extra gdk-pixbuf librsvg ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/data/themes/plano/default.nix b/pkgs/data/themes/plano/default.nix
index d672855df09d..b009bd2780c0 100644
--- a/pkgs/data/themes/plano/default.nix
+++ b/pkgs/data/themes/plano/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, gdk_pixbuf, gtk_engines, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, gdk-pixbuf, gtk_engines, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   pname = "plano-theme";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "0p9j4p32489jb6d67jhf9x26my0mddcc6a174x713drch8zvb96l";
   };
 
-  buildInputs = [ gdk_pixbuf gtk_engines ];
+  buildInputs = [ gdk-pixbuf gtk_engines ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/data/themes/plata/default.nix b/pkgs/data/themes/plata/default.nix
index 0d87cd848f84..52d843a5986c 100644
--- a/pkgs/data/themes/plata/default.nix
+++ b/pkgs/data/themes/plata/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitLab, autoreconfHook, pkgconfig, parallel
-, sassc, inkscape, libxml2, glib, gdk_pixbuf, librsvg, gtk-engine-murrine
+, sassc, inkscape, libxml2, glib, gdk-pixbuf, librsvg, gtk-engine-murrine
 , cinnamonSupport ? true
 , gnomeFlashbackSupport ? true
 , gnomeShellSupport ? true
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
   ++ stdenv.lib.optional telegramSupport zip;
 
   buildInputs = [
-    gdk_pixbuf
+    gdk-pixbuf
     librsvg
   ];
 
diff --git a/pkgs/data/themes/qogir/default.nix b/pkgs/data/themes/qogir/default.nix
index aac9ec5e85e1..4d91b60960b3 100644
--- a/pkgs/data/themes/qogir/default.nix
+++ b/pkgs/data/themes/qogir/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, gdk_pixbuf, librsvg, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, gdk-pixbuf, librsvg, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   pname = "qogir-theme";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "031nqr47b3x8ahcym7cfc75y8sy53dcmrrrlywi7m1a10ckfp0pd";
   };
 
-  buildInputs = [ gdk_pixbuf librsvg ];
+  buildInputs = [ gdk-pixbuf librsvg ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/data/themes/sierra/default.nix b/pkgs/data/themes/sierra/default.nix
index b845522a28a1..e5b5ad8d611f 100644
--- a/pkgs/data/themes/sierra/default.nix
+++ b/pkgs/data/themes/sierra/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, libxml2, gdk_pixbuf, librsvg, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, libxml2, gdk-pixbuf, librsvg, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   pname = "sierra-gtk-theme";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ libxml2 ];
 
-  buildInputs = [ gdk_pixbuf librsvg ];
+  buildInputs = [ gdk-pixbuf librsvg ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/data/themes/stilo/default.nix b/pkgs/data/themes/stilo/default.nix
index 48f29ad31113..61ec697d841a 100644
--- a/pkgs/data/themes/stilo/default.nix
+++ b/pkgs/data/themes/stilo/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, meson, ninja, sassc, gdk_pixbuf, librsvg, gtk_engines, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, meson, ninja, sassc, gdk-pixbuf, librsvg, gtk_engines, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   pname = "stilo-themes";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ meson ninja sassc ];
 
-  buildInputs = [ gdk_pixbuf librsvg gtk_engines ];
+  buildInputs = [ gdk-pixbuf librsvg gtk_engines ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/data/themes/zuki/default.nix b/pkgs/data/themes/zuki/default.nix
index f55ed31c1cef..59099bf52278 100644
--- a/pkgs/data/themes/zuki/default.nix
+++ b/pkgs/data/themes/zuki/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, meson, ninja, sassc, gdk_pixbuf, librsvg, gtk_engines, gtk-engine-murrine }:
+{ stdenv, fetchFromGitHub, meson, ninja, sassc, gdk-pixbuf, librsvg, gtk_engines, gtk-engine-murrine }:
 
 stdenv.mkDerivation rec {
   pname = "zuki-themes";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ meson ninja sassc ];
 
-  buildInputs = [ gdk_pixbuf librsvg gtk_engines ];
+  buildInputs = [ gdk-pixbuf librsvg gtk_engines ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/desktops/deepin/go-lib/default.nix b/pkgs/desktops/deepin/go-lib/default.nix
index a6282b979f76..6f3a851eb2f1 100644
--- a/pkgs/desktops/deepin/go-lib/default.nix
+++ b/pkgs/desktops/deepin/go-lib/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, glib, xorg, gdk_pixbuf, pulseaudio,
+{ stdenv, fetchFromGitHub, glib, xorg, gdk-pixbuf, pulseaudio,
   mobile-broadband-provider-info, deepin }:
 
 stdenv.mkDerivation rec {
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     glib
     xorg.libX11
-    gdk_pixbuf
+    gdk-pixbuf
     pulseaudio
     mobile-broadband-provider-info
   ];
diff --git a/pkgs/desktops/deepin/qcef/default.nix b/pkgs/desktops/deepin/qcef/default.nix
index 8e75917907ac..eb220dcdae6e 100644
--- a/pkgs/desktops/deepin/qcef/default.nix
+++ b/pkgs/desktops/deepin/qcef/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, pkgconfig, cmake, qtbase, qttools,
   qtwebchannel, qtx11extras,
   gnome2, nss, nspr, alsaLib, atk, cairo, cups, dbus,
-  expat, fontconfig, gdk_pixbuf, glib, gtk2,
+  expat, fontconfig, gdk-pixbuf, glib, gtk2,
   libxcb, pango, pulseaudio, xorg, deepin }:
 
 let
@@ -14,7 +14,7 @@ let
     dbus
     expat
     fontconfig
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gtk2
diff --git a/pkgs/desktops/gnome-3/apps/cheese/default.nix b/pkgs/desktops/gnome-3/apps/cheese/default.nix
index 4e5595385b48..f21e81237b26 100644
--- a/pkgs/desktops/gnome-3/apps/cheese/default.nix
+++ b/pkgs/desktops/gnome-3/apps/cheese/default.nix
@@ -2,7 +2,7 @@
 , pkgconfig, gtk3, glib, clutter-gtk, clutter-gst, udev, gst_all_1, itstool
 , libgudev, autoreconfHook, vala, docbook_xml_dtd_43, docbook_xsl, appstream-glib
 , libxslt, yelp-tools, gnome-common, gtk-doc
-, adwaita-icon-theme, librsvg, totem, gdk_pixbuf, gnome3, gnome-desktop, libxml2 }:
+, adwaita-icon-theme, librsvg, totem, gdk-pixbuf, gnome3, gnome-desktop, libxml2 }:
 
 stdenv.mkDerivation rec {
   name = "cheese-${version}";
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     autoreconfHook gtk-doc yelp-tools gnome-common
   ];
   buildInputs = [ gtk3 glib gnome-video-effects
-                  gdk_pixbuf adwaita-icon-theme librsvg udev gst_all_1.gstreamer
+                  gdk-pixbuf adwaita-icon-theme librsvg udev gst_all_1.gstreamer
                   gst_all_1.gst-plugins-base gst_all_1.gst-plugins-good gnome-desktop
                   gst_all_1.gst-plugins-bad clutter-gtk clutter-gst
                   libcanberra-gtk3 libgudev ];
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
       # vp8enc preset
       --prefix GST_PRESET_PATH : "${gst_all_1.gst-plugins-good}/share/gstreamer-1.0/presets"
       # Thumbnailers
-      --prefix XDG_DATA_DIRS : "${gdk_pixbuf}/share"
+      --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
       --prefix XDG_DATA_DIRS : "${totem}/share"
     )
   '';
diff --git a/pkgs/desktops/gnome-3/apps/evolution/default.nix b/pkgs/desktops/gnome-3/apps/evolution/default.nix
index b82c1b2dfe58..621506653d62 100644
--- a/pkgs/desktops/gnome-3/apps/evolution/default.nix
+++ b/pkgs/desktops/gnome-3/apps/evolution/default.nix
@@ -27,7 +27,7 @@
 , sqlite
 , gnome3
 , librsvg
-, gdk_pixbuf
+, gdk-pixbuf
 , libsecret
 , nss
 , nspr
@@ -65,7 +65,7 @@ stdenv.mkDerivation rec {
     db
     evolution-data-server
     gcr
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     glib-networking
     gnome-desktop
diff --git a/pkgs/desktops/gnome-3/apps/glade/default.nix b/pkgs/desktops/gnome-3/apps/glade/default.nix
index e0078d5ae410..4424eb4a3fd4 100644
--- a/pkgs/desktops/gnome-3/apps/glade/default.nix
+++ b/pkgs/desktops/gnome-3/apps/glade/default.nix
@@ -1,7 +1,7 @@
 { stdenv, intltool, fetchurl, python3
 , pkgconfig, gtk3, glib, gobject-introspection
 , wrapGAppsHook, itstool, libxml2, docbook_xsl
-, gnome3, gdk_pixbuf, libxslt, gsettings-desktop-schemas }:
+, gnome3, gdk-pixbuf, libxslt, gsettings-desktop-schemas }:
 
 stdenv.mkDerivation rec {
   name = "glade-${version}";
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     gtk3 glib libxml2 python3 python3.pkgs.pygobject3
     gsettings-desktop-schemas
-    gdk_pixbuf gnome3.adwaita-icon-theme
+    gdk-pixbuf gnome3.adwaita-icon-theme
   ];
 
   enableParallelBuilding = true;
diff --git a/pkgs/desktops/gnome-3/apps/gnome-books/default.nix b/pkgs/desktops/gnome-3/apps/gnome-books/default.nix
index 6edf86ec552b..25ee957224c7 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-books/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-books/default.nix
@@ -1,6 +1,6 @@
 { stdenv, meson, ninja, gettext, fetchurl, evince, gjs
 , pkgconfig, gtk3, glib, tracker, tracker-miners, libxslt
-, webkitgtk, gnome-desktop, libgepub, gnome3, gdk_pixbuf
+, webkitgtk, gnome-desktop, libgepub, gnome3, gdk-pixbuf
 , gsettings-desktop-schemas, adwaita-icon-theme, docbook_xsl
 , docbook_xml_dtd_42, desktop-file-utils, python3
 , gobject-introspection, wrapGAppsHook }:
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     gtk3 glib gsettings-desktop-schemas
-    gdk_pixbuf adwaita-icon-theme evince
+    gdk-pixbuf adwaita-icon-theme evince
     webkitgtk gjs gobject-introspection tracker
     tracker-miners gnome-desktop libgepub
   ];
diff --git a/pkgs/desktops/gnome-3/apps/gnome-clocks/default.nix b/pkgs/desktops/gnome-3/apps/gnome-clocks/default.nix
index f29f324f2ee8..d2845bef2a13 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-clocks/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-clocks/default.nix
@@ -2,7 +2,7 @@
 , meson, ninja, gettext, pkgconfig, wrapGAppsHook, itstool, desktop-file-utils
 , vala, gobject-introspection, libxml2, gtk3, glib, gsound, sound-theme-freedesktop
 , gsettings-desktop-schemas, adwaita-icon-theme, gnome-desktop, geocode-glib
-, gnome3, gdk_pixbuf, geoclue2, libgweather }:
+, gnome3, gdk-pixbuf, geoclue2, libgweather }:
 
 stdenv.mkDerivation rec {
   name = "gnome-clocks-${version}";
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
     gobject-introspection # for finding vapi files
   ];
   buildInputs = [
-    gtk3 glib gsettings-desktop-schemas gdk_pixbuf adwaita-icon-theme
+    gtk3 glib gsettings-desktop-schemas gdk-pixbuf adwaita-icon-theme
     gnome-desktop geocode-glib geoclue2 libgweather gsound
   ];
 
diff --git a/pkgs/desktops/gnome-3/apps/gnome-documents/default.nix b/pkgs/desktops/gnome-3/apps/gnome-documents/default.nix
index e0f28bc3446d..e8796d49e9a1 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-documents/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-documents/default.nix
@@ -2,7 +2,7 @@
 , pkgconfig, gtk3, glib, tracker, tracker-miners
 , itstool, libxslt, webkitgtk, libgdata
 , gnome-desktop, libzapojit, libgepub
-, gnome3, gdk_pixbuf, libsoup, docbook_xsl, docbook_xml_dtd_42
+, gnome3, gdk-pixbuf, libsoup, docbook_xsl, docbook_xml_dtd_42
 , gobject-introspection, inkscape, poppler_utils
 , desktop-file-utils, wrapGAppsHook, python3, gsettings-desktop-schemas }:
 
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   ];
   buildInputs = [
     gtk3 glib gsettings-desktop-schemas
-    gdk_pixbuf gnome3.adwaita-icon-theme evince
+    gdk-pixbuf gnome3.adwaita-icon-theme evince
     libsoup webkitgtk gjs gobject-introspection
     tracker tracker-miners libgdata
     gnome-desktop libzapojit libgepub
diff --git a/pkgs/desktops/gnome-3/apps/gnome-maps/default.nix b/pkgs/desktops/gnome-3/apps/gnome-maps/default.nix
index 25faf2676b82..6011092c0e0e 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-maps/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-maps/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, meson, ninja, gettext, python3, pkgconfig, gnome3, gtk3
-, gobject-introspection, gdk_pixbuf, librsvg, libgweather
+, gobject-introspection, gdk-pixbuf, librsvg, libgweather
 , geoclue2, wrapGAppsHook, folks, libchamplain, gfbgraph, libsoup, gsettings-desktop-schemas
 , webkitgtk, gjs, libgee, geocode-glib, evolution-data-server, gnome-online-accounts }:
 
@@ -21,7 +21,7 @@ in stdenv.mkDerivation rec {
     gobject-introspection
     gtk3 geoclue2 gjs libgee folks gfbgraph
     geocode-glib libchamplain libsoup
-    gdk_pixbuf librsvg libgweather
+    gdk-pixbuf librsvg libgweather
     gsettings-desktop-schemas evolution-data-server
     gnome-online-accounts gnome3.adwaita-icon-theme
     webkitgtk
diff --git a/pkgs/desktops/gnome-3/apps/gnome-music/default.nix b/pkgs/desktops/gnome-3/apps/gnome-music/default.nix
index 1f1bfafb5950..9b8c96729ad7 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-music/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-music/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, meson, ninja, gettext, fetchurl, gdk_pixbuf, tracker
+{ stdenv, meson, ninja, gettext, fetchurl, gdk-pixbuf, tracker
 , libxml2, python3, libnotify, wrapGAppsHook, libmediaart
 , gobject-introspection, gnome-online-accounts, grilo, grilo-plugins
 , pkgconfig, gtk3, glib, desktop-file-utils, appstream-glib
@@ -18,7 +18,7 @@ python3.pkgs.buildPythonApplication rec {
   nativeBuildInputs = [ meson ninja gettext itstool pkgconfig libxml2 wrapGAppsHook desktop-file-utils appstream-glib gobject-introspection ];
   buildInputs = with gst_all_1; [
     gtk3 glib libmediaart gnome-online-accounts gobject-introspection
-    gdk_pixbuf gnome3.adwaita-icon-theme python3
+    gdk-pixbuf gnome3.adwaita-icon-theme python3
     grilo grilo-plugins libnotify libdazzle libsoup
     gsettings-desktop-schemas tracker
     gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly
diff --git a/pkgs/desktops/gnome-3/apps/gnome-photos/default.nix b/pkgs/desktops/gnome-3/apps/gnome-photos/default.nix
index 9d08cc24aadb..e5bd4d8b950f 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-photos/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-photos/default.nix
@@ -3,7 +3,7 @@
 , itstool, gegl, babl, libdazzle, gfbgraph, grilo-plugins
 , grilo, gnome-online-accounts
 , desktop-file-utils, wrapGAppsHook
-, gnome3, gdk_pixbuf, gexiv2, geocode-glib
+, gnome3, gdk-pixbuf, gexiv2, geocode-glib
 , dleyna-renderer, dbus, meson, ninja, python3, gsettings-desktop-schemas }:
 
 let
@@ -26,7 +26,7 @@ in stdenv.mkDerivation rec {
   buildInputs = [
     gtk3 glib gegl babl libgdata libdazzle
     gsettings-desktop-schemas
-    gdk_pixbuf gnome3.adwaita-icon-theme
+    gdk-pixbuf gnome3.adwaita-icon-theme
     gfbgraph grilo-plugins grilo
     gnome-online-accounts tracker
     gexiv2 geocode-glib dleyna-renderer
diff --git a/pkgs/desktops/gnome-3/apps/gnome-sound-recorder/default.nix b/pkgs/desktops/gnome-3/apps/gnome-sound-recorder/default.nix
index fbf80fc32e84..907c0424454a 100644
--- a/pkgs/desktops/gnome-3/apps/gnome-sound-recorder/default.nix
+++ b/pkgs/desktops/gnome-3/apps/gnome-sound-recorder/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gettext, gobject-introspection, wrapGAppsHook, gjs, glib, gtk3, gdk_pixbuf, gst_all_1, gnome3
+{ stdenv, fetchurl, pkgconfig, gettext, gobject-introspection, wrapGAppsHook, gjs, glib, gtk3, gdk-pixbuf, gst_all_1, gnome3
 , meson, ninja, python3, hicolor-icon-theme, desktop-file-utils }:
 
 stdenv.mkDerivation rec {
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
     pkgconfig gettext meson ninja gobject-introspection
     wrapGAppsHook python3 hicolor-icon-theme desktop-file-utils
   ];
-  buildInputs = [ gjs glib gtk3 gdk_pixbuf ] ++ (with gst_all_1; [ gstreamer.dev gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad ]);
+  buildInputs = [ gjs glib gtk3 gdk-pixbuf ] ++ (with gst_all_1; [ gstreamer.dev gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad ]);
 
   postPatch = ''
     chmod +x build-aux/meson_post_install.py
diff --git a/pkgs/desktops/gnome-3/apps/polari/default.nix b/pkgs/desktops/gnome-3/apps/polari/default.nix
index 73b8016d97b4..51fea63b7142 100644
--- a/pkgs/desktops/gnome-3/apps/polari/default.nix
+++ b/pkgs/desktops/gnome-3/apps/polari/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, itstool, fetchurl, gdk_pixbuf, adwaita-icon-theme
+{ stdenv, itstool, fetchurl, gdk-pixbuf, adwaita-icon-theme
 , telepathy-glib, gjs, meson, ninja, gettext, telepathy-idle, libxml2, desktop-file-utils
 , pkgconfig, gtk3, glib, libsecret, libsoup, gobject-introspection, appstream-glib
 , gnome3, wrapGAppsHook, telepathy-logger, gspell, gsettings-desktop-schemas }:
@@ -23,7 +23,7 @@ in stdenv.mkDerivation rec {
 
   buildInputs = [
     gtk3 glib adwaita-icon-theme gsettings-desktop-schemas
-    telepathy-glib telepathy-logger gjs gspell gdk_pixbuf libsecret libsoup
+    telepathy-glib telepathy-logger gjs gspell gdk-pixbuf libsecret libsoup
   ];
 
   passthru = {
diff --git a/pkgs/desktops/gnome-3/core/adwaita-icon-theme/default.nix b/pkgs/desktops/gnome-3/core/adwaita-icon-theme/default.nix
index 0f88372d9cfb..9ef94adcbd09 100644
--- a/pkgs/desktops/gnome-3/core/adwaita-icon-theme/default.nix
+++ b/pkgs/desktops/gnome-3/core/adwaita-icon-theme/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, intltool, gnome3
-, iconnamingutils, gtk3, gdk_pixbuf, librsvg, hicolor-icon-theme }:
+, iconnamingutils, gtk3, gdk-pixbuf, librsvg, hicolor-icon-theme }:
 
 stdenv.mkDerivation rec {
   name = "adwaita-icon-theme-${version}";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   # For convenience, we can specify adwaita-icon-theme only in packages
   propagatedBuildInputs = [ hicolor-icon-theme ];
 
-  buildInputs = [ gdk_pixbuf librsvg ];
+  buildInputs = [ gdk-pixbuf librsvg ];
 
   nativeBuildInputs = [ pkgconfig intltool iconnamingutils gtk3 ];
 
diff --git a/pkgs/desktops/gnome-3/core/empathy/default.nix b/pkgs/desktops/gnome-3/core/empathy/default.nix
index 5a08454cb35e..73c3f65a968a 100644
--- a/pkgs/desktops/gnome-3/core/empathy/default.nix
+++ b/pkgs/desktops/gnome-3/core/empathy/default.nix
@@ -1,5 +1,5 @@
 { stdenv, intltool, fetchurl, webkitgtk, pkgconfig, gtk3, glib
-, file, librsvg, gnome3, gdk_pixbuf, python3
+, file, librsvg, gnome3, gdk-pixbuf, python3
 , telepathy-glib, telepathy-farstream, glibcLocales
 , clutter-gtk, clutter-gst, gst_all_1, cogl, gnome-online-accounts
 , gcr, libsecret, folks, libpulseaudio, telepathy-mission-control
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
     gtk3 glib webkitgtk icu gnome-online-accounts
     telepathy-glib clutter-gtk clutter-gst cogl
     gst_all_1.gstreamer gst_all_1.gst-plugins-base
-    gcr libsecret libpulseaudio gdk_pixbuf
+    gcr libsecret libpulseaudio gdk-pixbuf
     libnotify clutter libsoup gnutls libgee p11-kit
     libcanberra-gtk3 telepathy-farstream farstream
     gnome3.adwaita-icon-theme gsettings-desktop-schemas
diff --git a/pkgs/desktops/gnome-3/core/eog/default.nix b/pkgs/desktops/gnome-3/core/eog/default.nix
index 5c896ec01fc0..8bb727a6fc53 100644
--- a/pkgs/desktops/gnome-3/core/eog/default.nix
+++ b/pkgs/desktops/gnome-3/core/eog/default.nix
@@ -1,5 +1,5 @@
 { fetchurl, stdenv, meson, ninja, gettext, itstool, pkgconfig, libxml2, libjpeg, libpeas, gnome3
-, gtk3, glib, gsettings-desktop-schemas, adwaita-icon-theme, gnome-desktop, lcms2, gdk_pixbuf, exempi
+, gtk3, glib, gsettings-desktop-schemas, adwaita-icon-theme, gnome-desktop, lcms2, gdk-pixbuf, exempi
 , shared-mime-info, wrapGAppsHook, librsvg, libexif, gobject-introspection, python3 }:
 
 let
@@ -16,7 +16,7 @@ in stdenv.mkDerivation rec {
   nativeBuildInputs = [ meson ninja pkgconfig gettext itstool wrapGAppsHook libxml2 gobject-introspection python3 ];
 
   buildInputs = [
-    libjpeg gtk3 gdk_pixbuf glib libpeas librsvg lcms2 gnome-desktop libexif exempi
+    libjpeg gtk3 gdk-pixbuf glib libpeas librsvg lcms2 gnome-desktop libexif exempi
     gsettings-desktop-schemas shared-mime-info adwaita-icon-theme
   ];
 
@@ -28,7 +28,7 @@ in stdenv.mkDerivation rec {
   preFixup = ''
     gappsWrapperArgs+=(
       # Thumbnailers
-      --prefix XDG_DATA_DIRS : "${gdk_pixbuf}/share"
+      --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
       --prefix XDG_DATA_DIRS : "${librsvg}/share"
       --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"
     )
diff --git a/pkgs/desktops/gnome-3/core/epiphany/default.nix b/pkgs/desktops/gnome-3/core/epiphany/default.nix
index f4e87b50906b..776da94242fc 100644
--- a/pkgs/desktops/gnome-3/core/epiphany/default.nix
+++ b/pkgs/desktops/gnome-3/core/epiphany/default.nix
@@ -2,7 +2,7 @@
 , wrapGAppsHook, gnome3, libxml2, libxslt, itstool
 , webkitgtk, libsoup, glib-networking, libsecret, gnome-desktop, libnotify, p11-kit
 , sqlite, gcr, isocodes, desktop-file-utils, python3
-, gdk_pixbuf, gst_all_1, json-glib, libdazzle, libhandy }:
+, gdk-pixbuf, gst_all_1, json-glib, libdazzle, libhandy }:
 
 stdenv.mkDerivation rec {
   name = "epiphany-${version}";
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     gtk3 glib webkitgtk libsoup libxml2 libsecret gnome-desktop libnotify
     sqlite isocodes p11-kit icu libhandy
-    gdk_pixbuf gnome3.adwaita-icon-theme gcr
+    gdk-pixbuf gnome3.adwaita-icon-theme gcr
     glib-networking gst_all_1.gstreamer gst_all_1.gst-plugins-base
     gst_all_1.gst-plugins-good gst_all_1.gst-plugins-bad gst_all_1.gst-plugins-ugly
     gst_all_1.gst-libav json-glib libdazzle
diff --git a/pkgs/desktops/gnome-3/core/evince/default.nix b/pkgs/desktops/gnome-3/core/evince/default.nix
index 68beb0e47e35..9313ca8990c9 100644
--- a/pkgs/desktops/gnome-3/core/evince/default.nix
+++ b/pkgs/desktops/gnome-3/core/evince/default.nix
@@ -11,7 +11,7 @@
 , gtk3
 , pango
 , atk
-, gdk_pixbuf
+, gdk-pixbuf
 , shared-mime-info
 , itstool
 , gnome3
@@ -83,7 +83,7 @@ stdenv.mkDerivation rec {
     gtk3
     pango
     atk
-    gdk_pixbuf
+    gdk-pixbuf
     libxml2
     gsettings-desktop-schemas
     poppler
diff --git a/pkgs/desktops/gnome-3/core/gjs/default.nix b/pkgs/desktops/gnome-3/core/gjs/default.nix
index ef4de3699151..4e43d5f9d50c 100644
--- a/pkgs/desktops/gnome-3/core/gjs/default.nix
+++ b/pkgs/desktops/gnome-3/core/gjs/default.nix
@@ -1,5 +1,5 @@
 { fetchurl, stdenv, pkgconfig, gnome3, gtk3, atk, gobject-introspection
-, spidermonkey_60, pango, readline, glib, libxml2, dbus, gdk_pixbuf
+, spidermonkey_60, pango, readline, glib, libxml2, dbus, gdk-pixbuf
 , makeWrapper }:
 
 stdenv.mkDerivation rec {
@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
     moveToOutput "libexec/gjs/installed-tests" "$installedTests"
 
     wrapProgram "$installedTests/libexec/gjs/installed-tests/minijasmine" \
-      --prefix GI_TYPELIB_PATH : "${stdenv.lib.makeSearchPath "lib/girepository-1.0" [ gtk3 atk pango.out gdk_pixbuf ]}:$installedTests/libexec/gjs/installed-tests"
+      --prefix GI_TYPELIB_PATH : "${stdenv.lib.makeSearchPath "lib/girepository-1.0" [ gtk3 atk pango.out gdk-pixbuf ]}:$installedTests/libexec/gjs/installed-tests"
   '';
 
   meta = with stdenv.lib; {
diff --git a/pkgs/desktops/gnome-3/core/gnome-control-center/default.nix b/pkgs/desktops/gnome-3/core/gnome-control-center/default.nix
index c7a9b4ccfbd1..e947f8625c61 100644
--- a/pkgs/desktops/gnome-3/core/gnome-control-center/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-control-center/default.nix
@@ -1,6 +1,6 @@
 { fetchurl, stdenv, substituteAll, meson, ninja, pkgconfig, gnome3, ibus, gettext, upower, wrapGAppsHook
 , libcanberra-gtk3, accountsservice, libpwquality, libpulseaudio
-, gdk_pixbuf, librsvg, libgudev, libsecret, gnome-color-manager
+, gdk-pixbuf, librsvg, libgudev, libsecret, gnome-color-manager
 , libxml2, polkit, libxslt, libgtop, libsoup, colord, colord-gtk
 , libkrb5, networkmanagerapplet, networkmanager, glibc
 , libwacom, samba, shared-mime-info, tzdata, libgnomekbd
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
     gnome-online-accounts libsoup colord libpulseaudio fontconfig colord-gtk
     accountsservice libkrb5 networkmanagerapplet libwacom samba
     grilo libpwquality vino libcanberra-gtk3 libgudev libsecret
-    gdk_pixbuf adwaita-icon-theme librsvg clutter clutter-gtk cheese
+    gdk-pixbuf adwaita-icon-theme librsvg clutter clutter-gtk cheese
     networkmanager modemmanager gnome-bluetooth tracker
     udisks2 gsound libhandy
     mutter # schemas for the keybindings
@@ -60,7 +60,7 @@ stdenv.mkDerivation rec {
     gappsWrapperArgs+=(
       --prefix XDG_DATA_DIRS : "${sound-theme-freedesktop}/share"
       # Thumbnailers (for setting user profile pictures)
-      --prefix XDG_DATA_DIRS : "${gdk_pixbuf}/share"
+      --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
       --prefix XDG_DATA_DIRS : "${librsvg}/share"
       # WM keyboard shortcuts
       --prefix XDG_DATA_DIRS : "${mutter}/share"
diff --git a/pkgs/desktops/gnome-3/core/gnome-remote-desktop/default.nix b/pkgs/desktops/gnome-3/core/gnome-remote-desktop/default.nix
index 4a22fc535197..fd507acc009d 100644
--- a/pkgs/desktops/gnome-3/core/gnome-remote-desktop/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-remote-desktop/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitLab, meson, ninja, pkgconfig, python3, wrapGAppsHook
-, glib, pipewire, systemd, libvncserver, libsecret, libnotify, gdk_pixbuf, gnome3 }:
+, glib, pipewire, systemd, libvncserver, libsecret, libnotify, gdk-pixbuf, gnome3 }:
 
 stdenv.mkDerivation rec {
   pname = "gnome-remote-desktop";
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     glib pipewire systemd libvncserver libsecret libnotify
-    gdk_pixbuf # For libnotify
+    gdk-pixbuf # For libnotify
   ];
 
   postPatch = ''
diff --git a/pkgs/desktops/gnome-3/core/gnome-shell/default.nix b/pkgs/desktops/gnome-3/core/gnome-shell/default.nix
index d9001d9b1b94..1363cf6d6695 100644
--- a/pkgs/desktops/gnome-3/core/gnome-shell/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-shell/default.nix
@@ -3,7 +3,7 @@
 , libstartup_notification, telepathy-glib, telepathy-logger, libXtst, unzip, glibcLocales, shared-mime-info
 , libgweather, libcanberra-gtk3, librsvg, geoclue2, perl, docbook_xml_dtd_42, desktop-file-utils
 , libpulseaudio, libical, gobject-introspection, gstreamer, wrapGAppsHook, libxslt, gcr, caribou
-, accountsservice, gdk_pixbuf, gdm, upower, ibus, networkmanagerapplet, libgnomekbd, gnome-desktop
+, accountsservice, gdk-pixbuf, gdm, upower, ibus, networkmanagerapplet, libgnomekbd, gnome-desktop
 , gsettings-desktop-schemas, gnome-keyring, glib, gjs, mutter, evolution-data-server, gtk3
 , sassc, systemd, gst_all_1, adwaita-icon-theme, gnome-bluetooth, gnome-clocks, gnome-settings-daemon }:
 
@@ -30,7 +30,7 @@ in stdenv.mkDerivation rec {
   buildInputs = [
     systemd caribou
     gsettings-desktop-schemas gnome-keyring glib gcr json-glib accountsservice
-    libcroco libsecret libsoup polkit gdk_pixbuf librsvg
+    libcroco libsecret libsoup polkit gdk-pixbuf librsvg
     clutter networkmanager libstartup_notification telepathy-glib
     libXtst gjs mutter libpulseaudio evolution-data-server
     libical gtk3 gstreamer gdm libcanberra-gtk3 geoclue2
diff --git a/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix b/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix
index 83159c2ad72f..5c332c4135c5 100644
--- a/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix
@@ -1,6 +1,6 @@
 { stdenv, gettext, fetchurl, pkgconfig, gtkmm3, libxml2, polkit
 , bash, gtk3, glib, wrapGAppsHook, meson, ninja, python3
-, gsettings-desktop-schemas, itstool, gnome3, librsvg, gdk_pixbuf, libgtop, systemd }:
+, gsettings-desktop-schemas, itstool, gnome3, librsvg, gdk-pixbuf, libgtop, systemd }:
 
 stdenv.mkDerivation rec {
   name = "gnome-system-monitor-${version}";
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     polkit # for ITS file
   ];
   buildInputs = [
-    bash gtk3 glib libxml2 gtkmm3 libgtop gdk_pixbuf gnome3.adwaita-icon-theme librsvg
+    bash gtk3 glib libxml2 gtkmm3 libgtop gdk-pixbuf gnome3.adwaita-icon-theme librsvg
     gsettings-desktop-schemas systemd
   ];
 
diff --git a/pkgs/desktops/gnome-3/core/gnome-themes-extra/default.nix b/pkgs/desktops/gnome-3/core/gnome-themes-extra/default.nix
index 3d5cfb85d671..5cd8f2494815 100644
--- a/pkgs/desktops/gnome-3/core/gnome-themes-extra/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-themes-extra/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, intltool, gtk3, gnome3, librsvg, pkgconfig, pango, atk, gtk2
-, gdk_pixbuf }:
+, gdk-pixbuf }:
 
 let
   pname = "gnome-themes-extra";
@@ -19,7 +19,7 @@ in stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkgconfig intltool ];
-  buildInputs = [ gtk3 librsvg pango atk gtk2 gdk_pixbuf gnome3.adwaita-icon-theme ];
+  buildInputs = [ gtk3 librsvg pango atk gtk2 gdk-pixbuf gnome3.adwaita-icon-theme ];
 
   postFixup = ''
     gtk-update-icon-cache "$out"/share/icons/HighContrast
diff --git a/pkgs/desktops/gnome-3/core/nautilus/default.nix b/pkgs/desktops/gnome-3/core/nautilus/default.nix
index 2eeb77db0c65..854ce9364468 100644
--- a/pkgs/desktops/gnome-3/core/nautilus/default.nix
+++ b/pkgs/desktops/gnome-3/core/nautilus/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, meson, ninja, pkgconfig, gettext, libxml2
 , desktop-file-utils, python3, wrapGAppsHook , gtk3, gnome3, gnome-autoar
 , glib-networking, shared-mime-info, libnotify, libexif, libseccomp , exempi
-, librsvg, tracker, tracker-miners, gexiv2, libselinux, gdk_pixbuf
+, librsvg, tracker, tracker-miners, gexiv2, libselinux, gdk-pixbuf
 , substituteAll, bubblewrap, gst_all_1, gsettings-desktop-schemas
 }:
 
@@ -32,7 +32,7 @@ in stdenv.mkDerivation rec {
   preFixup = ''
     gappsWrapperArgs+=(
       # Thumbnailers
-      --prefix XDG_DATA_DIRS : "${gdk_pixbuf}/share"
+      --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
       --prefix XDG_DATA_DIRS : "${librsvg}/share"
       --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"
     )
diff --git a/pkgs/desktops/gnome-3/core/simple-scan/default.nix b/pkgs/desktops/gnome-3/core/simple-scan/default.nix
index 047e79e14e5c..4f57c5247d97 100644
--- a/pkgs/desktops/gnome-3/core/simple-scan/default.nix
+++ b/pkgs/desktops/gnome-3/core/simple-scan/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, meson, ninja, pkgconfig, gettext, itstool, python3, wrapGAppsHook
-, cairo, gdk_pixbuf, colord, glib, gtk3, gusb, packagekit, libwebp
+, cairo, gdk-pixbuf, colord, glib, gtk3, gusb, packagekit, libwebp
 , libxml2, sane-backends, vala, gnome3, gobject-introspection }:
 
 stdenv.mkDerivation rec {
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [
-    cairo gdk_pixbuf colord glib gnome3.adwaita-icon-theme gusb
+    cairo gdk-pixbuf colord glib gnome3.adwaita-icon-theme gusb
     gtk3 libwebp packagekit sane-backends vala
   ];
   nativeBuildInputs = [
diff --git a/pkgs/desktops/gnome-3/core/sushi/default.nix b/pkgs/desktops/gnome-3/core/sushi/default.nix
index c0d5d2be26d4..5554dbdfe302 100644
--- a/pkgs/desktops/gnome-3/core/sushi/default.nix
+++ b/pkgs/desktops/gnome-3/core/sushi/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, pkgconfig, meson, gettext, gobject-introspection, glib
 , clutter-gtk, clutter-gst, gnome3, gtksourceview, gjs
 , webkitgtk, libmusicbrainz5, icu, wrapGAppsHook, gst_all_1
-, gdk_pixbuf, librsvg, gtk3, harfbuzz, ninja }:
+, gdk-pixbuf, librsvg, gtk3, harfbuzz, ninja }:
 
 stdenv.mkDerivation rec {
   name = "sushi-${version}";
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   ];
   buildInputs = [
     glib gtk3 gnome3.evince icu harfbuzz
-    clutter-gtk clutter-gst gjs gtksourceview gdk_pixbuf
+    clutter-gtk clutter-gst gjs gtksourceview gdk-pixbuf
     librsvg libmusicbrainz5 webkitgtk
     gst_all_1.gstreamer gst_all_1.gst-plugins-base gst_all_1.gst-plugins-good
   ];
diff --git a/pkgs/desktops/gnome-3/core/totem/default.nix b/pkgs/desktops/gnome-3/core/totem/default.nix
index 15417d4ddbb9..4953b7ec7a82 100644
--- a/pkgs/desktops/gnome-3/core/totem/default.nix
+++ b/pkgs/desktops/gnome-3/core/totem/default.nix
@@ -3,7 +3,7 @@
 , pkgconfig, gtk3, glib, gobject-introspection, totem-pl-parser
 , wrapGAppsHook, itstool, libxml2, vala, gnome3, grilo, grilo-plugins
 , libpeas, adwaita-icon-theme, gnome-desktop, gsettings-desktop-schemas
-, gdk_pixbuf, tracker, nautilus, xvfb_run }:
+, gdk-pixbuf, tracker, nautilus, xvfb_run }:
 
 stdenv.mkDerivation rec {
   name = "totem-${version}";
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     gtk3 glib grilo clutter-gtk clutter-gst totem-pl-parser grilo-plugins
     gst_all_1.gstreamer gst_all_1.gst-plugins-base gst_all_1.gst-plugins-good gst_all_1.gst-plugins-bad
     gst_all_1.gst-plugins-ugly gst_all_1.gst-libav libpeas shared-mime-info
-    gdk_pixbuf libxml2 adwaita-icon-theme gnome-desktop
+    gdk-pixbuf libxml2 adwaita-icon-theme gnome-desktop
     gsettings-desktop-schemas tracker nautilus
     python3Packages.pygobject3 python3Packages.dbus-python # for plug-ins
   ];
diff --git a/pkgs/desktops/gnome-3/games/atomix/default.nix b/pkgs/desktops/gnome-3/games/atomix/default.nix
index 00b3a04a1683..c9395166c521 100644
--- a/pkgs/desktops/gnome-3/games/atomix/default.nix
+++ b/pkgs/desktops/gnome-3/games/atomix/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, meson, ninja, pkgconfig, wrapGAppsHook, python3
-, gettext, gnome3, glib, gtk3, libgnome-games-support, gdk_pixbuf }:
+, gettext, gnome3, glib, gtk3, libgnome-games-support, gdk-pixbuf }:
 
 let
   pname = "atomix";
@@ -13,7 +13,7 @@ in stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ meson ninja pkgconfig gettext wrapGAppsHook python3 ];
-  buildInputs = [ glib gtk3 gdk_pixbuf libgnome-games-support gnome3.adwaita-icon-theme ];
+  buildInputs = [ glib gtk3 gdk-pixbuf libgnome-games-support gnome3.adwaita-icon-theme ];
 
   postPatch = ''
     chmod +x meson_post_install.py
diff --git a/pkgs/desktops/gnome-3/games/iagno/default.nix b/pkgs/desktops/gnome-3/games/iagno/default.nix
index 540e379210ee..86a1bd6485be 100644
--- a/pkgs/desktops/gnome-3/games/iagno/default.nix
+++ b/pkgs/desktops/gnome-3/games/iagno/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gtk3, gnome3, gdk_pixbuf, librsvg, wrapGAppsHook
+{ stdenv, fetchurl, pkgconfig, gtk3, gnome3, gdk-pixbuf, librsvg, wrapGAppsHook
 , itstool, libcanberra-gtk3, libxml2
 , meson, ninja, python3, vala, desktop-file-utils
 }:
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
     meson ninja python3 vala desktop-file-utils
     pkgconfig wrapGAppsHook itstool libxml2
   ];
-  buildInputs = [ gtk3 gnome3.adwaita-icon-theme gdk_pixbuf librsvg libcanberra-gtk3 ];
+  buildInputs = [ gtk3 gnome3.adwaita-icon-theme gdk-pixbuf librsvg libcanberra-gtk3 ];
 
   enableParallelBuilding = true;
 
diff --git a/pkgs/desktops/gnome-3/games/lightsoff/default.nix b/pkgs/desktops/gnome-3/games/lightsoff/default.nix
index 18c6f43b3b36..5801c2935632 100644
--- a/pkgs/desktops/gnome-3/games/lightsoff/default.nix
+++ b/pkgs/desktops/gnome-3/games/lightsoff/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, vala, pkgconfig, gtk3, gnome3, gdk_pixbuf, librsvg, wrapGAppsHook
+{ stdenv, fetchurl, vala, pkgconfig, gtk3, gnome3, gdk-pixbuf, librsvg, wrapGAppsHook
 , gettext, itstool, clutter, clutter-gtk, libxml2, appstream-glib
 , meson, ninja, python3 }:
 
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
     vala pkgconfig wrapGAppsHook itstool gettext appstream-glib libxml2
     meson ninja python3
   ];
-  buildInputs = [ gtk3 gnome3.adwaita-icon-theme gdk_pixbuf librsvg clutter clutter-gtk ];
+  buildInputs = [ gtk3 gnome3.adwaita-icon-theme gdk-pixbuf librsvg clutter clutter-gtk ];
 
   postPatch = ''
     chmod +x build-aux/meson_post_install.py
diff --git a/pkgs/desktops/gnome-3/games/quadrapassel/default.nix b/pkgs/desktops/gnome-3/games/quadrapassel/default.nix
index 712f984cbf9a..78ed0d9fa68a 100644
--- a/pkgs/desktops/gnome-3/games/quadrapassel/default.nix
+++ b/pkgs/desktops/gnome-3/games/quadrapassel/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gtk3, gnome3, gdk_pixbuf
+{ stdenv, fetchurl, pkgconfig, gtk3, gnome3, gdk-pixbuf
 , librsvg, libcanberra-gtk3, libmanette
 , gettext, itstool, libxml2, clutter, clutter-gtk, wrapGAppsHook
 , meson, ninja, python3, vala, desktop-file-utils
@@ -21,7 +21,7 @@ in stdenv.mkDerivation rec {
     libxml2 itstool gettext wrapGAppsHook
   ];
   buildInputs = [
-    gtk3 gdk_pixbuf librsvg libmanette
+    gtk3 gdk-pixbuf librsvg libmanette
     libcanberra-gtk3 clutter libxml2 clutter-gtk
   ];
 
diff --git a/pkgs/desktops/gnome-3/games/tali/default.nix b/pkgs/desktops/gnome-3/games/tali/default.nix
index 5ec29554b363..d9f3e5fc5ff8 100644
--- a/pkgs/desktops/gnome-3/games/tali/default.nix
+++ b/pkgs/desktops/gnome-3/games/tali/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gtk3, gnome3, gdk_pixbuf
+{ stdenv, fetchurl, pkgconfig, gtk3, gnome3, gdk-pixbuf
 , librsvg, gettext, itstool, libxml2, wrapGAppsHook
 , meson, ninja, python3, desktop-file-utils
 }:
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     pkgconfig gnome3.adwaita-icon-theme
     libxml2 itstool gettext wrapGAppsHook
   ];
-  buildInputs = [ gtk3 gdk_pixbuf librsvg ];
+  buildInputs = [ gtk3 gdk-pixbuf librsvg ];
 
   postPatch = ''
     chmod +x build-aux/meson_post_install.py
diff --git a/pkgs/desktops/gnome-3/misc/gnome-tweaks/default.nix b/pkgs/desktops/gnome-3/misc/gnome-tweaks/default.nix
index fd7f7ef609df..7a54114d2dbc 100644
--- a/pkgs/desktops/gnome-3/misc/gnome-tweaks/default.nix
+++ b/pkgs/desktops/gnome-3/misc/gnome-tweaks/default.nix
@@ -1,7 +1,7 @@
 { stdenv, meson, ninja, gettext, fetchurl
 , pkgconfig, gtk3, glib, libsoup, gsettings-desktop-schemas
 , itstool, libxml2, python3Packages
-, gnome3, gdk_pixbuf, libnotify, gobject-introspection, wrapGAppsHook }:
+, gnome3, gdk-pixbuf, libnotify, gobject-introspection, wrapGAppsHook }:
 
 let
   pname = "gnome-tweaks";
@@ -19,7 +19,7 @@ in stdenv.mkDerivation rec {
   ];
   buildInputs = [
     gtk3 glib gsettings-desktop-schemas
-    gdk_pixbuf gnome3.adwaita-icon-theme
+    gdk-pixbuf gnome3.adwaita-icon-theme
     libnotify gnome3.gnome-shell python3Packages.pygobject3
     libsoup gnome3.gnome-settings-daemon gnome3.nautilus
     gnome3.mutter gnome3.gnome-desktop gobject-introspection
diff --git a/pkgs/desktops/lxde/core/lxpanel/default.nix b/pkgs/desktops/lxde/core/lxpanel/default.nix
index af9570a2c733..a24a33c2e76b 100644
--- a/pkgs/desktops/lxde/core/lxpanel/default.nix
+++ b/pkgs/desktops/lxde/core/lxpanel/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, gettext, m4, intltool, libxmlxx, keybinder
-, gtk2, libX11, libfm, libwnck, libXmu, libXpm, cairo, gdk_pixbuf
+, gtk2, libX11, libfm, libwnck, libXmu, libXpm, cairo, gdk-pixbuf
 , menu-cache, lxmenu-data, wirelesstools
 , supportAlsa ? false, alsaLib
 }:
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig gettext m4 intltool libxmlxx ];
   buildInputs = [
-    keybinder gtk2 libX11 libfm libwnck libXmu libXpm cairo gdk_pixbuf
+    keybinder gtk2 libX11 libfm libwnck libXmu libXpm cairo gdk-pixbuf
     menu-cache lxmenu-data m4 wirelesstools
   ] ++ stdenv.lib.optional supportAlsa alsaLib;
 
diff --git a/pkgs/desktops/mate/caja-dropbox/default.nix b/pkgs/desktops/mate/caja-dropbox/default.nix
index f5b71eba141a..597391eb135c 100644
--- a/pkgs/desktops/mate/caja-dropbox/default.nix
+++ b/pkgs/desktops/mate/caja-dropbox/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, substituteAll
-, pkgconfig, gobject-introspection, gdk_pixbuf
+, pkgconfig, gobject-introspection, gdk-pixbuf
 , gtk3, mate, python3, dropbox }:
 
 let
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     pkgconfig
     gobject-introspection
-    gdk_pixbuf
+    gdk-pixbuf
     (python3.withPackages (ps: with ps; [
       docutils
       pygobject3
diff --git a/pkgs/desktops/mate/mate-themes/default.nix b/pkgs/desktops/mate/mate-themes/default.nix
index 3c7b16a68312..a4724049f7c1 100644
--- a/pkgs/desktops/mate/mate-themes/default.nix
+++ b/pkgs/desktops/mate/mate-themes/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, intltool, mate, gtk2, gtk3,
-  gtk_engines, gtk-engine-murrine, gdk_pixbuf, librsvg }:
+  gtk_engines, gtk-engine-murrine, gdk-pixbuf, librsvg }:
 
 stdenv.mkDerivation rec {
   name = "mate-themes-${version}";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig intltool gtk3 ];
 
-  buildInputs = [ mate.mate-icon-theme gtk2 gtk_engines gdk_pixbuf librsvg ];
+  buildInputs = [ mate.mate-icon-theme gtk2 gtk_engines gdk-pixbuf librsvg ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/desktops/maxx/default.nix b/pkgs/desktops/maxx/default.nix
index 5edebb39be41..aaf9986fbb2d 100644
--- a/pkgs/desktops/maxx/default.nix
+++ b/pkgs/desktops/maxx/default.nix
@@ -3,7 +3,7 @@
 
 , libX11, libXext, libXi, libXau, libXrender, libXft, libXmu, libSM, libXcomposite, libXfixes, libXpm
 , libXinerama, libXdamage, libICE, libXtst, libXaw, fontconfig, pango, cairo, glib, libxml2, atk, gtk2
-, gdk_pixbuf, libGL, ncurses5
+, gdk-pixbuf, libGL, ncurses5
 
 , dmidecode, pciutils, usbutils
 }:
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     stdenv.cc.cc libX11 libXext libXi libXau libXrender libXft libXmu libSM libXcomposite libXfixes libXpm
     libXinerama libXdamage libICE libXtst libXaw fontconfig pango cairo glib libxml2 atk gtk2
-    gdk_pixbuf libGL ncurses5
+    gdk-pixbuf libGL ncurses5
   ];
 
   buildPhase = ''
@@ -70,7 +70,7 @@ stdenv.mkDerivation rec {
     maintainers = [ maintainers.gnidorah ];
     platforms = ["x86_64-linux"];
     longDescription = ''
-      A clone of IRIX Interactive Desktop made in agreement with SGI. 
+      A clone of IRIX Interactive Desktop made in agreement with SGI.
       Provides simple and fast retro desktop environment.
     '';
   };
diff --git a/pkgs/desktops/xfce/core/tumbler.nix b/pkgs/desktops/xfce/core/tumbler.nix
index 3e1d2be2b531..9087d3a02553 100644
--- a/pkgs/desktops/xfce/core/tumbler.nix
+++ b/pkgs/desktops/xfce/core/tumbler.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, intltool, dbus-glib, gdk_pixbuf, curl, freetype
+{ stdenv, fetchurl, pkgconfig, intltool, dbus-glib, gdk-pixbuf, curl, freetype
 , libgsf, poppler, bzip2 }:
 let
   p_name  = "tumbler";
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
-    intltool dbus-glib gdk_pixbuf curl freetype
+    intltool dbus-glib gdk-pixbuf curl freetype
     poppler libgsf bzip2
   ];
 
diff --git a/pkgs/desktops/xfce4-14/thunar/default.nix b/pkgs/desktops/xfce4-14/thunar/default.nix
index e559505aca65..27fe256490a1 100644
--- a/pkgs/desktops/xfce4-14/thunar/default.nix
+++ b/pkgs/desktops/xfce4-14/thunar/default.nix
@@ -1,4 +1,4 @@
-{ mkXfceDerivation, docbook_xsl, exo, gdk_pixbuf, gtk3, libgudev ? null
+{ mkXfceDerivation, docbook_xsl, exo, gdk-pixbuf, gtk3, libgudev ? null
 , libnotify ? null, libX11, libxfce4ui, libxfce4util, libxslt, xfconf }:
 
 mkXfceDerivation rec {
@@ -19,7 +19,7 @@ mkXfceDerivation rec {
 
   buildInputs = [
     exo
-    gdk_pixbuf
+    gdk-pixbuf
     gtk3
     libgudev
     libnotify
diff --git a/pkgs/desktops/xfce4-14/tumbler/default.nix b/pkgs/desktops/xfce4-14/tumbler/default.nix
index e67c7f1e2989..81cc0922ff35 100644
--- a/pkgs/desktops/xfce4-14/tumbler/default.nix
+++ b/pkgs/desktops/xfce4-14/tumbler/default.nix
@@ -1,4 +1,4 @@
-{ mkXfceDerivation, gdk_pixbuf ? null, ffmpegthumbnailer ? null, libgsf ? null
+{ mkXfceDerivation, gdk-pixbuf ? null, ffmpegthumbnailer ? null, libgsf ? null
 , poppler ? null }:
 
 # TODO: add libopenraw
@@ -11,5 +11,5 @@ mkXfceDerivation rec {
 
   sha256 = "1k579g8dmcfpw1vakspv6k2qkr1y1axyr8cbd0fqjhqdj4pis81i";
 
-  buildInputs = [ gdk_pixbuf ffmpegthumbnailer libgsf poppler ];
+  buildInputs = [ gdk-pixbuf ffmpegthumbnailer libgsf poppler ];
 }
diff --git a/pkgs/development/arduino/arduino-core/default.nix b/pkgs/development/arduino/arduino-core/default.nix
index 2df5d16dbac6..5d151e5fa210 100644
--- a/pkgs/development/arduino/arduino-core/default.nix
+++ b/pkgs/development/arduino/arduino-core/default.nix
@@ -3,7 +3,7 @@
 , withGui ? false, gtk2 ? null, withTeensyduino ? false
   /* Packages needed for Teensyduino */
 , upx, fontconfig, xorg, gcc
-, atk, glib, pango, gdk_pixbuf, libpng12, expat, freetype,
+, atk, glib, pango, gdk-pixbuf, libpng12, expat, freetype,
 }:
 
 assert withGui -> gtk2 != null;
@@ -36,7 +36,7 @@ let
     fontconfig
     freetype
     gcc.cc.lib
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk2
     libpng12
@@ -115,7 +115,7 @@ stdenv.mkDerivation rec {
     substituteInPlace build/build.xml --replace "get src" "get error"
 
     cd ./arduino-core && ant
-    cd ../build && ant 
+    cd ../build && ant
     cd ..
   '';
 
diff --git a/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix b/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix
index 8e8b157aa229..a837c6f1e851 100644
--- a/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix
+++ b/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix
@@ -17,7 +17,7 @@ sourcePerArch:
 , cairo
 , alsaLib
 , atk
-, gdk_pixbuf
+, gdk-pixbuf
 , zlib
 , elfutils
 }:
@@ -35,7 +35,7 @@ let
 
   libraries = [
     stdenv.cc.libc glib libxml2 ffmpeg_2 libxslt libGL
-    xorg.libXxf86vm alsaLib fontconfig freetype pango gtk2 cairo gdk_pixbuf
+    xorg.libXxf86vm alsaLib fontconfig freetype pango gtk2 cairo gdk-pixbuf
     atk zlib elfutils
   ] ++ (stdenv.lib.optionals swingSupport [
     xorg.libX11 xorg.libXext xorg.libXtst xorg.libXi xorg.libXp xorg.libXt
diff --git a/pkgs/development/compilers/cudatoolkit/default.nix b/pkgs/development/compilers/cudatoolkit/default.nix
index 6a18c05f38e5..5b9e9010ef05 100644
--- a/pkgs/development/compilers/cudatoolkit/default.nix
+++ b/pkgs/development/compilers/cudatoolkit/default.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, makeWrapper, fetchurl, requireFile, perl, ncurses5, expat, python27, zlib
 , gcc48, gcc49, gcc5, gcc6, gcc7
-, xorg, gtk2, gdk_pixbuf, glib, fontconfig, freetype, unixODBC, alsaLib, glibc
+, xorg, gtk2, gdk-pixbuf, glib, fontconfig, freetype, unixODBC, alsaLib, glibc
 , addOpenGLRunpath
 }:
 
@@ -41,7 +41,7 @@ let
       outputs = [ "out" "lib" "doc" ];
 
       nativeBuildInputs = [ perl makeWrapper addOpenGLRunpath ];
-      buildInputs = [ gdk_pixbuf ]; # To get $GDK_PIXBUF_MODULE_FILE via setup-hook
+      buildInputs = [ gdk-pixbuf ]; # To get $GDK_PIXBUF_MODULE_FILE via setup-hook
       runtimeDependencies = [
         ncurses5 expat python zlib glibc
         xorg.libX11 xorg.libXext xorg.libXrender xorg.libXt xorg.libXtst xorg.libXi xorg.libXext
diff --git a/pkgs/development/compilers/factor-lang/default.nix b/pkgs/development/compilers/factor-lang/default.nix
index 0f9a1a94bcc9..405aa8aa3ca5 100644
--- a/pkgs/development/compilers/factor-lang/default.nix
+++ b/pkgs/development/compilers/factor-lang/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, glib, git,
   rlwrap, curl, pkgconfig, perl, makeWrapper, tzdata, ncurses,
-  pango, cairo, gtk2, gdk_pixbuf, gtkglext,
+  pango, cairo, gtk2, gdk-pixbuf, gtkglext,
   mesa, xorg, openssl, unzip }:
 
 stdenv.mkDerivation rec {
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = with xorg; [ git rlwrap curl pkgconfig perl makeWrapper
-    libX11 pango cairo gtk2 gdk_pixbuf gtkglext
+    libX11 pango cairo gtk2 gdk-pixbuf gtkglext
     mesa libXmu libXt libICE libSM openssl unzip ];
 
   buildPhase = ''
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     # will work only on the known libraries. There does not seem
     # to be a generic solution here.
     find $(echo ${stdenv.lib.makeLibraryPath (with xorg; [
-        glib libX11 pango cairo gtk2 gdk_pixbuf gtkglext
+        glib libX11 pango cairo gtk2 gdk-pixbuf gtkglext
         mesa libXmu libXt libICE libSM ])} | sed -e 's#:# #g') -name \*.so.\* > $TMPDIR/so.lst
 
     (echo $(cat $TMPDIR/so.lst | wc -l) "libs found in cache \`/etc/ld.so.cache'";
@@ -69,7 +69,7 @@ stdenv.mkDerivation rec {
     cp ./factor $out/bin
     wrapProgram $out/bin/factor --prefix LD_LIBRARY_PATH : \
       "${stdenv.lib.makeLibraryPath (with xorg; [ glib
-        libX11 pango cairo gtk2 gdk_pixbuf gtkglext
+        libX11 pango cairo gtk2 gdk-pixbuf gtkglext
         mesa libXmu libXt libICE libSM openssl])}"
 
     sed -ie 's#/bin/.factor-wrapped#/lib/factor/factor#g' $out/bin/factor
diff --git a/pkgs/development/compilers/fpc/lazarus.nix b/pkgs/development/compilers/fpc/lazarus.nix
index 74ca246deb09..3fe72e6b5057 100644
--- a/pkgs/development/compilers/fpc/lazarus.nix
+++ b/pkgs/development/compilers/fpc/lazarus.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, makeWrapper
-, fpc, gtk2, glib, pango, atk, gdk_pixbuf
+, fpc, gtk2, glib, pango, atk, gdk-pixbuf
 , libXi, xorgproto, libX11, libXext
 }:
 stdenv.mkDerivation rec {
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     fpc gtk2 glib libXi xorgproto
     libX11 libXext pango atk
-    stdenv.cc makeWrapper gdk_pixbuf
+    stdenv.cc makeWrapper gdk-pixbuf
   ];
 
   makeFlags = [
diff --git a/pkgs/development/compilers/jetbrains-jdk/default.nix b/pkgs/development/compilers/jetbrains-jdk/default.nix
index 08e3ec4f445f..d407fb46b9b5 100644
--- a/pkgs/development/compilers/jetbrains-jdk/default.nix
+++ b/pkgs/development/compilers/jetbrains-jdk/default.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchurl, file, glib, libxml2, libav_0_8, ffmpeg, libxslt
 , libGL , xorg, alsaLib, fontconfig, freetype, pango, gtk2, cairo
-, gdk_pixbuf, atk, zlib }:
+, gdk-pixbuf, atk, zlib }:
 
 # TODO: Investigate building from source instead of patching binaries.
 # TODO: Binary patching for not just x86_64-linux but also x86_64-darwin i686-linux
@@ -38,7 +38,7 @@ let drv = stdenv.mkDerivation rec {
 
   rpath = lib.makeLibraryPath ([
     stdenv.cc.cc stdenv.cc.libc glib libxml2 libav_0_8 ffmpeg libxslt libGL
-    alsaLib fontconfig freetype pango gtk2 cairo gdk_pixbuf atk zlib
+    alsaLib fontconfig freetype pango gtk2 cairo gdk-pixbuf atk zlib
     (placeholder "out")
   ] ++ (with xorg; [
     libX11 libXext libXtst libXi libXp libXt libXrender libXxf86vm
diff --git a/pkgs/development/compilers/oraclejdk/jdk-linux-base.nix b/pkgs/development/compilers/oraclejdk/jdk-linux-base.nix
index ea6b9d2a9fe7..e80d81dc5a00 100644
--- a/pkgs/development/compilers/oraclejdk/jdk-linux-base.nix
+++ b/pkgs/development/compilers/oraclejdk/jdk-linux-base.nix
@@ -32,7 +32,7 @@
 , cairo
 , alsaLib
 , atk
-, gdk_pixbuf
+, gdk-pixbuf
 , setJavaClassPath
 }:
 
@@ -183,7 +183,7 @@ let result = stdenv.mkDerivation rec {
    * libXt is only needed on amd64
    */
   libraries =
-    [stdenv.cc.libc glib libxml2 libav_0_8 ffmpeg libxslt libGL xorg.libXxf86vm alsaLib fontconfig freetype pango gtk2 cairo gdk_pixbuf atk] ++
+    [stdenv.cc.libc glib libxml2 libav_0_8 ffmpeg libxslt libGL xorg.libXxf86vm alsaLib fontconfig freetype pango gtk2 cairo gdk-pixbuf atk] ++
     (if swingSupport then [xorg.libX11 xorg.libXext xorg.libXtst xorg.libXi xorg.libXp xorg.libXt xorg.libXrender stdenv.cc.cc] else []);
 
   rpath = stdenv.lib.strings.makeLibraryPath libraries;
diff --git a/pkgs/development/compilers/zulu/8.nix b/pkgs/development/compilers/zulu/8.nix
index fb1798ab819c..cc42ee1dd3f1 100644
--- a/pkgs/development/compilers/zulu/8.nix
+++ b/pkgs/development/compilers/zulu/8.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchurl, unzip, makeWrapper, setJavaClassPath
 , zulu, glib, libxml2, libav_0_8, ffmpeg, libxslt, libGL, alsaLib
-, fontconfig, freetype, gnome2, cairo, gdk_pixbuf, atk, xorg
+, fontconfig, freetype, gnome2, cairo, gdk-pixbuf, atk, xorg
 , swingSupport ? true }:
 
 let
@@ -17,7 +17,7 @@ let
   libraries = [
     stdenv.cc.libc glib libxml2 libav_0_8 ffmpeg libxslt libGL
     xorg.libXxf86vm alsaLib fontconfig freetype gnome2.pango
-    gnome2.gtk cairo gdk_pixbuf atk
+    gnome2.gtk cairo gdk-pixbuf atk
   ] ++ (lib.optionals swingSupport (with xorg; [
     xorg.libX11 xorg.libXext xorg.libXtst xorg.libXi xorg.libXp
     xorg.libXt xorg.libXrender stdenv.cc.cc
diff --git a/pkgs/development/compilers/zulu/default.nix b/pkgs/development/compilers/zulu/default.nix
index 908aa29e178f..a43992164d23 100644
--- a/pkgs/development/compilers/zulu/default.nix
+++ b/pkgs/development/compilers/zulu/default.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchurl, unzip, makeWrapper, setJavaClassPath
 , zulu, glib, libxml2, libav_0_8, ffmpeg, libxslt, libGL, alsaLib
-, fontconfig, freetype, gnome2, cairo, gdk_pixbuf, atk, xorg, zlib
+, fontconfig, freetype, gnome2, cairo, gdk-pixbuf, atk, xorg, zlib
 , swingSupport ? true }:
 
 let
@@ -17,7 +17,7 @@ let
   libraries = [
     stdenv.cc.libc glib libxml2 libav_0_8 ffmpeg libxslt libGL
     xorg.libXxf86vm alsaLib fontconfig freetype gnome2.pango
-    gnome2.gtk cairo gdk_pixbuf atk zlib
+    gnome2.gtk cairo gdk-pixbuf atk zlib
   ] ++ (lib.optionals swingSupport (with xorg; [
     xorg.libX11 xorg.libXext xorg.libXtst xorg.libXi xorg.libXp
     xorg.libXt xorg.libXrender stdenv.cc.cc
diff --git a/pkgs/development/libraries/appstream-glib/default.nix b/pkgs/development/libraries/appstream-glib/default.nix
index 45ad58819c32..c9395ea6df7d 100644
--- a/pkgs/development/libraries/appstream-glib/default.nix
+++ b/pkgs/development/libraries/appstream-glib/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, substituteAll, pkgconfig, gettext, gtk3, glib
 , gtk-doc, libarchive, gobject-introspection, libxslt, pngquant
 , sqlite, libsoup, attr, acl, docbook_xsl, docbook_xml_dtd_42
-, libuuid, json-glib, meson, gperf, ninja, gdk_pixbuf
+, libuuid, json-glib, meson, gperf, ninja, gdk-pixbuf
 }:
 stdenv.mkDerivation rec {
   name = "appstream-glib-0.7.15";
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     glib gettext sqlite libsoup
     attr acl libuuid json-glib
-    libarchive gperf gdk_pixbuf
+    libarchive gperf gdk-pixbuf
   ];
   propagatedBuildInputs = [ gtk3 ];
 
diff --git a/pkgs/development/libraries/clutter-gst/default.nix b/pkgs/development/libraries/clutter-gst/default.nix
index 9577bfe9e8a2..3c88327c790b 100644
--- a/pkgs/development/libraries/clutter-gst/default.nix
+++ b/pkgs/development/libraries/clutter-gst/default.nix
@@ -1,4 +1,4 @@
-{ fetchurl, stdenv, pkgconfig, clutter, gtk3, glib, cogl, gnome3, gdk_pixbuf }:
+{ fetchurl, stdenv, pkgconfig, clutter, gtk3, glib, cogl, gnome3, gdk-pixbuf }:
 
 let
   pname = "clutter-gst";
@@ -11,7 +11,7 @@ in stdenv.mkDerivation rec {
     sha256 = "17czmpl92dzi4h3rn5rishk015yi3jwiw29zv8qan94xcmnbssgy";
   };
 
-  propagatedBuildInputs = [ clutter gtk3 glib cogl gdk_pixbuf ];
+  propagatedBuildInputs = [ clutter gtk3 glib cogl gdk-pixbuf ];
   nativeBuildInputs = [ pkgconfig ];
 
   postBuild = "rm -rf $out/share/gtk-doc";
diff --git a/pkgs/development/libraries/cogl/default.nix b/pkgs/development/libraries/cogl/default.nix
index 8eacbb4f855f..4700d9e2418e 100644
--- a/pkgs/development/libraries/cogl/default.nix
+++ b/pkgs/development/libraries/cogl/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, fetchpatch, pkgconfig, libGL, glib, gdk_pixbuf, xorg, libintl
+{ stdenv, fetchurl, fetchpatch, pkgconfig, libGL, glib, gdk-pixbuf, xorg, libintl
 , pangoSupport ? true, pango, cairo, gobject-introspection, wayland, gnome3
 , mesa
 , gstreamerSupport ? true, gst_all_1 }:
@@ -44,7 +44,7 @@ in stdenv.mkDerivation rec {
     ++ stdenv.lib.optionals (!stdenv.isDarwin) [ "--enable-gles1" "--enable-gles2" ];
 
   propagatedBuildInputs = with xorg; [
-      glib gdk_pixbuf gobject-introspection wayland mesa
+      glib gdk-pixbuf gobject-introspection wayland mesa
       libGL libXrandr libXfixes libXcomposite libXdamage
     ]
     ++ stdenv.lib.optionals gstreamerSupport [ gst_all_1.gstreamer
diff --git a/pkgs/development/libraries/gcr/default.nix b/pkgs/development/libraries/gcr/default.nix
index 218a44215c68..dcb4df1419ec 100644
--- a/pkgs/development/libraries/gcr/default.nix
+++ b/pkgs/development/libraries/gcr/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, intltool, gnupg, p11-kit, glib
-, libgcrypt, libtasn1, dbus-glib, gtk3, pango, gdk_pixbuf, atk
+, libgcrypt, libtasn1, dbus-glib, gtk3, pango, gdk-pixbuf, atk
 , gobject-introspection, makeWrapper, libxslt, vala, gnome3
 , python2 }:
 
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   buildInputs = let
     gpg = gnupg.override { guiSupport = false; }; # prevent build cycle with pinentry_gnome
   in [
-    gpg libgcrypt libtasn1 dbus-glib pango gdk_pixbuf atk
+    gpg libgcrypt libtasn1 dbus-glib pango gdk-pixbuf atk
   ];
 
   propagatedBuildInputs = [ glib gtk3 p11-kit ];
diff --git a/pkgs/development/libraries/gdk-pixbuf/default.nix b/pkgs/development/libraries/gdk-pixbuf/default.nix
index 48c232c122b3..59e7808057f4 100644
--- a/pkgs/development/libraries/gdk-pixbuf/default.nix
+++ b/pkgs/development/libraries/gdk-pixbuf/default.nix
@@ -83,7 +83,6 @@ in stdenv.mkDerivation rec {
   passthru = {
     updateScript = gnome3.updateScript {
       packageName = pname;
-      attrPath = "gdk_pixbuf";
     };
 
     # gdk_pixbuf_moduledir variable from gdk-pixbuf-2.0.pc
diff --git a/pkgs/development/libraries/geis/default.nix b/pkgs/development/libraries/geis/default.nix
index e1f243f8fd3b..4b9f67b7aaf8 100644
--- a/pkgs/development/libraries/geis/default.nix
+++ b/pkgs/development/libraries/geis/default.nix
@@ -6,7 +6,7 @@
 , dbus
 , evemu
 , frame
-, gdk_pixbuf
+, gdk-pixbuf
 , gobject-introspection
 , grail
 , gtk3
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
     [ pygobject3  ];
 
   nativeBuildInputs = [ pkgconfig wrapGAppsHook python3Packages.wrapPython];
-  buildInputs = [ atk dbus evemu frame gdk_pixbuf gobject-introspection grail
+  buildInputs = [ atk dbus evemu frame gdk-pixbuf gobject-introspection grail
     gtk3 libX11 libXext libXi libXtst pango python3Packages.python xorgserver
   ];
 
diff --git a/pkgs/development/libraries/geoclue/default.nix b/pkgs/development/libraries/geoclue/default.nix
index 466720176a92..cc2037791e01 100644
--- a/pkgs/development/libraries/geoclue/default.nix
+++ b/pkgs/development/libraries/geoclue/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitLab, intltool, meson, ninja, pkgconfig, gtk-doc, docbook_xsl, docbook_xml_dtd_412, glib, json-glib, libsoup, libnotify, gdk_pixbuf
+{ stdenv, fetchFromGitLab, intltool, meson, ninja, pkgconfig, gtk-doc, docbook_xsl, docbook_xml_dtd_412, glib, json-glib, libsoup, libnotify, gdk-pixbuf
 , modemmanager, avahi, glib-networking, python3, wrapGAppsHook, gobject-introspection, vala
 , withDemoAgent ? false
 }:
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     glib json-glib libsoup avahi
   ] ++ optionals withDemoAgent [
-    libnotify gdk_pixbuf
+    libnotify gdk-pixbuf
   ] ++ optionals (!stdenv.isDarwin) [ modemmanager ];
 
   propagatedBuildInputs = [ glib glib-networking ];
diff --git a/pkgs/development/libraries/gom/default.nix b/pkgs/development/libraries/gom/default.nix
index 5694c50e90a3..9a947c3ff828 100644
--- a/pkgs/development/libraries/gom/default.nix
+++ b/pkgs/development/libraries/gom/default.nix
@@ -7,7 +7,7 @@
 , glib
 , python3
 , sqlite
-, gdk_pixbuf
+, gdk-pixbuf
 , gnome3
 , gobject-introspection
 }:
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     sqlite
     python3.pkgs.pygobject3
diff --git a/pkgs/development/libraries/gstreamer/good/default.nix b/pkgs/development/libraries/gstreamer/good/default.nix
index b76142c9d86d..7ef9fbcc44bd 100644
--- a/pkgs/development/libraries/gstreamer/good/default.nix
+++ b/pkgs/development/libraries/gstreamer/good/default.nix
@@ -2,7 +2,7 @@
 , gst-plugins-base, orc, bzip2, gettext
 , libv4l, libdv, libavc1394, libiec61883
 , libvpx, speex, flac, taglib, libshout
-, cairo, gdk_pixbuf, aalib, libcaca
+, cairo, gdk-pixbuf, aalib, libcaca
 , libsoup, libpulseaudio, libintl
 , darwin, lame, mpg123, twolame
 , gtkSupport ? false, gtk3 ? null
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     gst-plugins-base orc bzip2
     libdv libvpx speex flac taglib
-    cairo gdk_pixbuf aalib libcaca
+    cairo gdk-pixbuf aalib libcaca
     libsoup libshout lame mpg123 twolame libintl
     libXdamage
     libXext
diff --git a/pkgs/development/libraries/gstreamer/legacy/gst-plugins-good/default.nix b/pkgs/development/libraries/gstreamer/legacy/gst-plugins-good/default.nix
index 7ecb6c34b432..2b78d4daaf30 100644
--- a/pkgs/development/libraries/gstreamer/legacy/gst-plugins-good/default.nix
+++ b/pkgs/development/libraries/gstreamer/legacy/gst-plugins-good/default.nix
@@ -1,6 +1,6 @@
 { fetchurl, stdenv, lib, pkgconfig, gst-plugins-base, aalib, cairo
 , flac, libjpeg, speex, libpng, libdv, libcaca, libvpx
-, taglib, libpulseaudio, gdk_pixbuf, orc
+, taglib, libpulseaudio, gdk-pixbuf, orc
 , glib, gstreamer, bzip2, libsoup, libshout, ncurses, libintl
 , # Whether to build no plugins that have external dependencies
   # (except the PulseAudio plugin).
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
     ++ lib.optional stdenv.isLinux libpulseaudio
     ++ lib.optionals (!minimalDeps)
       [ aalib libcaca cairo libdv flac libjpeg libpng speex
-        taglib bzip2 libvpx gdk_pixbuf orc libsoup libshout ];
+        taglib bzip2 libvpx gdk-pixbuf orc libsoup libshout ];
 
   enableParallelBuilding = true;
 
diff --git a/pkgs/development/libraries/gtk+/2.x.nix b/pkgs/development/libraries/gtk+/2.x.nix
index 8dad69eb998a..886f0aefafb8 100644
--- a/pkgs/development/libraries/gtk+/2.x.nix
+++ b/pkgs/development/libraries/gtk+/2.x.nix
@@ -1,5 +1,5 @@
 { config, stdenv, fetchurl, pkgconfig, gettext, glib, atk, pango, cairo, perl, xorg
-, gdk_pixbuf, xlibsWrapper, gobject-introspection
+, gdk-pixbuf, xlibsWrapper, gobject-introspection
 , xineramaSupport ? stdenv.isLinux
 , cupsSupport ? config.gtk2.cups or stdenv.isLinux, cups ? null
 , gdktarget ? if stdenv.isDarwin then "quartz" else "x11"
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
   ];
 
   propagatedBuildInputs = with xorg;
-    [ glib cairo pango gdk_pixbuf atk ]
+    [ glib cairo pango gdk-pixbuf atk ]
     ++ optionals (stdenv.isLinux || stdenv.isDarwin) [
          libXrandr libXrender libXcomposite libXi libXcursor
        ]
diff --git a/pkgs/development/libraries/gtk+/3.x.nix b/pkgs/development/libraries/gtk+/3.x.nix
index 8c3df083087c..074e4e29d51c 100644
--- a/pkgs/development/libraries/gtk+/3.x.nix
+++ b/pkgs/development/libraries/gtk+/3.x.nix
@@ -13,7 +13,7 @@
 , glib
 , cairo
 , pango
-, gdk_pixbuf
+, gdk-pixbuf
 , atk
 , at-spi2-atk
 , gobject-introspection
@@ -121,7 +121,7 @@ stdenv.mkDerivation rec {
     cairo
     expat
     fribidi
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gsettings-desktop-schemas
     libICE
diff --git a/pkgs/development/libraries/gtkd/default.nix b/pkgs/development/libraries/gtkd/default.nix
index 1c238a8424c0..c2f05b51a65e 100644
--- a/pkgs/development/libraries/gtkd/default.nix
+++ b/pkgs/development/libraries/gtkd/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, atk, cairo, dmd, gdk_pixbuf, gnome3, gst_all_1, librsvg
+{ stdenv, fetchzip, atk, cairo, dmd, gdk-pixbuf, gnome3, gst_all_1, librsvg
 , glib, gtk3, gtksourceview, libgda, libpeas, pango, pkgconfig, which, vte }:
 
 let
@@ -15,7 +15,7 @@ in stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ dmd pkgconfig which ];
   propagatedBuildInputs = [
-    atk cairo gdk_pixbuf glib gstreamer gst-plugins-base gtk3 gtksourceview
+    atk cairo gdk-pixbuf glib gstreamer gst-plugins-base gtk3 gtksourceview
     libgda libpeas librsvg pango vte
   ];
 
@@ -28,8 +28,8 @@ in stdenv.mkDerivation rec {
       --replace libcairo.so.2 ${cairo}/lib/libcairo.so.2 \
       --replace libcairo.dylib ${cairo}/lib/libcairo.dylib
     substituteInPlace generated/gtkd/gdkpixbuf/c/functions.d \
-      --replace libgdk_pixbuf-2.0.so.0 ${gdk_pixbuf}/lib/libgdk_pixbuf-2.0.so.0 \
-      --replace libgdk_pixbuf-2.0.0.dylib ${gdk_pixbuf}/lib/libgdk_pixbuf-2.0.0.dylib
+      --replace libgdk_pixbuf-2.0.so.0 ${gdk-pixbuf}/lib/libgdk_pixbuf-2.0.so.0 \
+      --replace libgdk_pixbuf-2.0.0.dylib ${gdk-pixbuf}/lib/libgdk_pixbuf-2.0.0.dylib
     substituteInPlace generated/gtkd/atk/c/functions.d \
       --replace libatk-1.0.so.0 ${atk}/lib/libatk-1.0.so.0 \
       --replace libatk-1.0.0.dylib ${atk}/lib/libatk-1.0.0.dylib
diff --git a/pkgs/development/libraries/java/swt/default.nix b/pkgs/development/libraries/java/swt/default.nix
index 0dc9e8bd892c..c2acd2348938 100644
--- a/pkgs/development/libraries/java/swt/default.nix
+++ b/pkgs/development/libraries/java/swt/default.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchurl, unzip, jdk, pkgconfig, gtk2
 , libXt, libXtst, libXi, libGLU_combined, webkitgtk, libsoup, xorg
-, pango, gdk_pixbuf, glib
+, pango, gdk-pixbuf, glib
 }:
 
 let
@@ -38,7 +38,7 @@ in stdenv.mkDerivation rec {
   nativeBuildInputs = [ unzip pkgconfig ];
   buildInputs = [ jdk gtk2 libXt libXtst libXi libGLU_combined webkitgtk libsoup ];
 
-  NIX_LFLAGS = (map (x: "-L${lib.getLib x}/lib") [ xorg.libX11 pango gdk_pixbuf glib ]) ++
+  NIX_LFLAGS = (map (x: "-L${lib.getLib x}/lib") [ xorg.libX11 pango gdk-pixbuf glib ]) ++
     [ "-lX11" "-lpango-1.0" "-lgdk_pixbuf-2.0" "-lglib-2.0" ];
 
   buildPhase = ''
diff --git a/pkgs/development/libraries/lasem/default.nix b/pkgs/development/libraries/lasem/default.nix
index b5e62b960c0a..5e00ce1037f2 100644
--- a/pkgs/development/libraries/lasem/default.nix
+++ b/pkgs/development/libraries/lasem/default.nix
@@ -1,4 +1,4 @@
-{ fetchurl, stdenv, pkgconfig, intltool, gobject-introspection, glib, gdk_pixbuf
+{ fetchurl, stdenv, pkgconfig, intltool, gobject-introspection, glib, gdk-pixbuf
 , libxml2, cairo, pango, gnome3 }:
 
 stdenv.mkDerivation rec {
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig intltool gobject-introspection ];
 
   propagatedBuildInputs = [
-    glib gdk_pixbuf libxml2 cairo pango
+    glib gdk-pixbuf libxml2 cairo pango
   ];
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/libraries/libcef/default.nix b/pkgs/development/libraries/libcef/default.nix
index 9e7d608b5124..ecba18cd58c8 100644
--- a/pkgs/development/libraries/libcef/default.nix
+++ b/pkgs/development/libraries/libcef/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, cmake, alsaLib, atk, cairo, cups, dbus, expat, fontconfig
-, GConf, gdk_pixbuf, glib, gtk2, libX11, libxcb, libXcomposite, libXcursor
+, GConf, gdk-pixbuf, glib, gtk2, libX11, libxcb, libXcomposite, libXcursor
 , libXdamage, libXext, libXfixes, libXi, libXrandr, libXrender, libXScrnSaver
 , libXtst, nspr, nss, pango, libpulseaudio, systemd }:
 
 let
   libPath =
     stdenv.lib.makeLibraryPath [
-      alsaLib atk cairo cups dbus expat fontconfig GConf gdk_pixbuf glib gtk2
+      alsaLib atk cairo cups dbus expat fontconfig GConf gdk-pixbuf glib gtk2
       libX11 libxcb libXcomposite libXcursor libXdamage libXext libXfixes libXi
       libXrandr libXrender libXScrnSaver libXtst nspr nss pango libpulseaudio
       systemd
diff --git a/pkgs/development/libraries/libgpod/default.nix b/pkgs/development/libraries/libgpod/default.nix
index b77690bd1593..d561ebcd7afb 100644
--- a/pkgs/development/libraries/libgpod/default.nix
+++ b/pkgs/development/libraries/libgpod/default.nix
@@ -1,5 +1,5 @@
 {stdenv, lib, fetchurl, gettext, perlPackages, intltool, pkgconfig, glib,
-  libxml2, sqlite, zlib, sg3_utils, gdk_pixbuf, taglib,
+  libxml2, sqlite, zlib, sg3_utils, gdk-pixbuf, taglib,
   libimobiledevice, pythonPackages, mutagen,
   monoSupport ? false, mono, gtk-sharp-2_0
 }:
@@ -23,7 +23,7 @@ in stdenv.mkDerivation rec {
   dontStrip = true;
 
   propagatedBuildInputs = [ glib libxml2 sqlite zlib sg3_utils
-    gdk_pixbuf taglib libimobiledevice python pygobject2 mutagen ];
+    gdk-pixbuf taglib libimobiledevice python pygobject2 mutagen ];
 
   nativeBuildInputs = [ gettext intltool pkgconfig ]
     ++ (with perlPackages; [ perl XMLParser ])
diff --git a/pkgs/development/libraries/libgsf/default.nix b/pkgs/development/libraries/libgsf/default.nix
index f2d31cf16762..89a72bba8724 100644
--- a/pkgs/development/libraries/libgsf/default.nix
+++ b/pkgs/development/libraries/libgsf/default.nix
@@ -1,5 +1,5 @@
 { fetchurl, stdenv, pkgconfig, intltool, gettext, glib, libxml2, zlib, bzip2
-, python, perl, gdk_pixbuf, libiconv, libintl, gnome3 }:
+, python, perl, gdk-pixbuf, libiconv, libintl, gnome3 }:
 
 stdenv.mkDerivation rec {
   pname = "libgsf";
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ gettext bzip2 zlib python ];
   checkInputs = [ perl ];
 
-  propagatedBuildInputs = [ libxml2 glib gdk_pixbuf libiconv ];
+  propagatedBuildInputs = [ libxml2 glib gdk-pixbuf libiconv ];
 
   outputs = [ "out" "dev" ];
 
diff --git a/pkgs/development/libraries/libmediaart/default.nix b/pkgs/development/libraries/libmediaart/default.nix
index 64d2cc7577c3..569c567e9282 100644
--- a/pkgs/development/libraries/libmediaart/default.nix
+++ b/pkgs/development/libraries/libmediaart/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, meson, ninja, pkgconfig, vala, gtk-doc, docbook_xsl, docbook_xml_dtd_412, glib, gdk_pixbuf, gobject-introspection, gnome3 }:
+{ stdenv, fetchurl, meson, ninja, pkgconfig, vala, gtk-doc, docbook_xsl, docbook_xml_dtd_412, glib, gdk-pixbuf, gobject-introspection, gnome3 }:
 
 stdenv.mkDerivation rec {
   pname = "libmediaart";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ meson ninja pkgconfig vala gtk-doc docbook_xsl docbook_xml_dtd_412 gobject-introspection ];
-  buildInputs = [ glib gdk_pixbuf ];
+  buildInputs = [ glib gdk-pixbuf ];
 
   # FIXME: Turn on again when https://github.com/NixOS/nixpkgs/issues/53701
   # is fixed on master.
diff --git a/pkgs/development/libraries/libnotify/default.nix b/pkgs/development/libraries/libnotify/default.nix
index ddadb3cd97b6..be1daa0505a0 100644
--- a/pkgs/development/libraries/libnotify/default.nix
+++ b/pkgs/development/libraries/libnotify/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, meson, ninja, pkgconfig, fetchpatch
-, glib, gdk_pixbuf, gobject-introspection, gnome3 }:
+, glib, gdk-pixbuf, gobject-introspection, gnome3 }:
 
 stdenv.mkDerivation rec {
   pname = "libnotify";
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   ];
 
   nativeBuildInputs = [ meson ninja pkgconfig gobject-introspection ];
-  buildInputs = [ glib gdk_pixbuf ];
+  buildInputs = [ glib gdk-pixbuf ];
 
   passthru = {
     updateScript = gnome3.updateScript {
diff --git a/pkgs/development/libraries/librsvg/default.nix b/pkgs/development/libraries/librsvg/default.nix
index 0cbd60409b43..a911524a9acd 100644
--- a/pkgs/development/libraries/librsvg/default.nix
+++ b/pkgs/development/libraries/librsvg/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, glib, gdk_pixbuf, pango, cairo, libxml2, libgsf
+{ lib, stdenv, fetchurl, pkgconfig, glib, gdk-pixbuf, pango, cairo, libxml2, libgsf
 , bzip2, libcroco, libintl, darwin, rustc, cargo, gnome3
 , withGTK ? false, gtk3 ? null
 , vala, gobject-introspection }:
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ libxml2 libgsf bzip2 libcroco pango libintl ];
 
-  propagatedBuildInputs = [ glib gdk_pixbuf cairo ] ++ lib.optional withGTK gtk3;
+  propagatedBuildInputs = [ glib gdk-pixbuf cairo ] ++ lib.optional withGTK gtk3;
 
   nativeBuildInputs = [ pkgconfig rustc cargo vala gobject-introspection ]
     ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
          -i gdk-pixbuf-loader/Makefile
 
     # Fix thumbnailer path
-    sed -e "s#@bindir@\(/gdk-pixbuf-thumbnailer\)#${gdk_pixbuf}/bin\1#g" \
+    sed -e "s#@bindir@\(/gdk-pixbuf-thumbnailer\)#${gdk-pixbuf}/bin\1#g" \
         -i gdk-pixbuf-loader/librsvg.thumbnailer.in
   '';
 
@@ -66,7 +66,7 @@ stdenv.mkDerivation rec {
   # Merge gdkpixbuf and librsvg loaders
   postInstall = ''
     mv $GDK_PIXBUF/loaders.cache $GDK_PIXBUF/loaders.cache.tmp
-    cat ${gdk_pixbuf.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache $GDK_PIXBUF/loaders.cache.tmp > $GDK_PIXBUF/loaders.cache
+    cat ${gdk-pixbuf.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache $GDK_PIXBUF/loaders.cache.tmp > $GDK_PIXBUF/loaders.cache
     rm $GDK_PIXBUF/loaders.cache.tmp
   '';
 
diff --git a/pkgs/development/libraries/qt-4.x/4.8/default.nix b/pkgs/development/libraries/qt-4.x/4.8/default.nix
index afd2a01e722b..de6457db98b2 100644
--- a/pkgs/development/libraries/qt-4.x/4.8/default.nix
+++ b/pkgs/development/libraries/qt-4.x/4.8/default.nix
@@ -6,7 +6,7 @@
 , buildMultimedia ? stdenv.isLinux, alsaLib, gstreamer, gst-plugins-base
 , buildWebkit ? (stdenv.isLinux || stdenv.isDarwin)
 , libGLSupported ? stdenv.lib.elem stdenv.hostPlatform.system stdenv.lib.platforms.mesaPlatforms
-, flashplayerFix ? false, gdk_pixbuf
+, flashplayerFix ? false, gdk-pixbuf
 , gtkStyle ? stdenv.hostPlatform == stdenv.buildPlatform, gtk2
 , gnomeStyle ? false, libgnomeui, GConf, gnome_vfs
 , developerBuild ? false
@@ -188,7 +188,7 @@ stdenv.mkDerivation rec {
     [ cups # Qt dlopen's libcups instead of linking to it
       postgresql sqlite libjpeg libmng libtiff icu ]
     ++ lib.optionals (mysql != null) [ mysql.connector-c ]
-    ++ lib.optionals gtkStyle [ gtk2 gdk_pixbuf ]
+    ++ lib.optionals gtkStyle [ gtk2 gdk-pixbuf ]
     ++ lib.optionals stdenv.isDarwin [ ApplicationServices OpenGL Cocoa AGL libcxx libobjc ];
 
   nativeBuildInputs = [ perl pkgconfig which ];
diff --git a/pkgs/development/ocaml-modules/ocaml-cairo/default.nix b/pkgs/development/ocaml-modules/ocaml-cairo/default.nix
index 22215b8da0dc..cd9d9f2d150e 100644
--- a/pkgs/development/ocaml-modules/ocaml-cairo/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-cairo/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, automake, ocaml, autoconf, gnum4, pkgconfig, freetype, lablgtk, unzip, cairo, findlib, gdk_pixbuf, gtk2, pango }:
+{stdenv, fetchurl, automake, ocaml, autoconf, gnum4, pkgconfig, freetype, lablgtk, unzip, cairo, findlib, gdk-pixbuf, gtk2, pango }:
 
 let
   pname = "ocaml-cairo";
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ ocaml automake gnum4 autoconf unzip
-                  findlib freetype lablgtk cairo gdk_pixbuf gtk2 pango ];
+                  findlib freetype lablgtk cairo gdk-pixbuf gtk2 pango ];
 
   createFindlibDestdir = true;
 
diff --git a/pkgs/development/python-modules/cairocffi/0_9.nix b/pkgs/development/python-modules/cairocffi/0_9.nix
index 19a469dad262..bd7bde42901e 100644
--- a/pkgs/development/python-modules/cairocffi/0_9.nix
+++ b/pkgs/development/python-modules/cairocffi/0_9.nix
@@ -1,4 +1,4 @@
-# FIXME: make gdk_pixbuf dependency optional
+# FIXME: make gdk-pixbuf dependency optional
 { stdenv
 , buildPythonPackage
 , pythonOlder
@@ -15,7 +15,7 @@
 , withXcffib ? false, xcffib
 , python
 , glib
-, gdk_pixbuf
+, gdk-pixbuf
 }@args:
 
 import ./generic.nix ({
diff --git a/pkgs/development/python-modules/cairocffi/default.nix b/pkgs/development/python-modules/cairocffi/default.nix
index 528c845c07ea..f91b33d20102 100644
--- a/pkgs/development/python-modules/cairocffi/default.nix
+++ b/pkgs/development/python-modules/cairocffi/default.nix
@@ -1,4 +1,4 @@
-# FIXME: make gdk_pixbuf dependency optional
+# FIXME: make gdk-pixbuf dependency optional
 { stdenv
 , buildPythonPackage
 , pythonOlder
@@ -15,7 +15,7 @@
 , withXcffib ? false, xcffib
 , python
 , glib
-, gdk_pixbuf
+, gdk-pixbuf
 }@args:
 
 import ./generic.nix ({
diff --git a/pkgs/development/python-modules/cairocffi/dlopen-paths-0.9.patch b/pkgs/development/python-modules/cairocffi/dlopen-paths-0.9.patch
index 862f7bd4bf7c..a1018e6eb33b 100644
--- a/pkgs/development/python-modules/cairocffi/dlopen-paths-0.9.patch
+++ b/pkgs/development/python-modules/cairocffi/dlopen-paths-0.9.patch
@@ -3,7 +3,7 @@ Author: Alexander V. Nikolaev <avn@avnik.info>
 Date:   Sat Feb 6 08:09:06 2016 +0200
 
     Patch dlopen() to allow direct paths to all required libs
-    
+
     This patch is NixOS specific
 
 diff --git a/cairocffi/__init__.py b/cairocffi/__init__.py
@@ -13,15 +13,15 @@ index 718aa7f..1a1dcff 100644
 @@ -27,20 +27,22 @@ VERSION = '0.7.2'
  version = '1.10.0'
  version_info = (1, 10, 0)
- 
+
 +# Use hardcoded soname, because ctypes.util use gcc/objdump which shouldn't be required for runtime
 +_LIBS = {
 +    'cairo': '@cairo@/lib/libcairo@ext@',
 +    'glib-2.0': '@glib@/lib/libglib-2.0@ext@',
 +    'gobject-2.0': '@glib@/lib/libgobject-2.0@ext@',
-+    'gdk_pixbuf-2.0': '@gdk_pixbuf@/lib/libgdk_pixbuf-2.0@ext@',
++    'gdk-pixbuf-2.0': '@gdk_pixbuf@/lib/libgdk_pixbuf-2.0@ext@',
 +}
- 
+
 -def dlopen(ffi, *names):
 +def dlopen(ffi, name, *names):
      """Try various names for the same library, for different platforms."""
@@ -42,6 +42,6 @@ index 718aa7f..1a1dcff 100644
 +        if lib:
 +            return lib
 +    raise OSError("dlopen() failed to load a library: %s as %s" % (name, path))
- 
- 
+
+
  cairo = dlopen(ffi, 'cairo', 'cairo-2')
diff --git a/pkgs/development/python-modules/cairocffi/dlopen-paths.patch b/pkgs/development/python-modules/cairocffi/dlopen-paths.patch
index d42b8bcce48e..9fd2832b323f 100644
--- a/pkgs/development/python-modules/cairocffi/dlopen-paths.patch
+++ b/pkgs/development/python-modules/cairocffi/dlopen-paths.patch
@@ -3,7 +3,7 @@ Author: Alexander V. Nikolaev <avn@avnik.info>
 Date:   Sat Feb 6 08:09:06 2016 +0200
 
     Patch dlopen() to allow direct paths to all required libs
-    
+
     This patch is NixOS specific
 
 diff --git a/cairocffi/__init__.py b/cairocffi/__init__.py
@@ -13,15 +13,15 @@ index 6061973..3538a58 100644
 @@ -21,19 +21,22 @@ VERSION = __version__ = (Path(__file__).parent / 'VERSION').read_text().strip()
  version = '1.16.0'
  version_info = (1, 16, 0)
- 
+
 +# Use hardcoded soname, because ctypes.util use gcc/objdump which shouldn't be required for runtime
 +_LIBS = {
 +    'cairo': '@cairo@/lib/libcairo@ext@',
 +    'glib-2.0': '@glib@/lib/libglib-2.0@ext@',
 +    'gobject-2.0': '@glib@/lib/libgobject-2.0@ext@',
-+    'gdk_pixbuf-2.0': '@gdk_pixbuf@/lib/libgdk_pixbuf-2.0@ext@',
++    'gdk-pixbuf-2.0': '@gdk_pixbuf@/lib/libgdk_pixbuf-2.0@ext@',
 +}
- 
+
 -def dlopen(ffi, *names):
 +def dlopen(ffi, name, *names):
      """Try various names for the same library, for different platforms."""
@@ -41,6 +41,6 @@ index 6061973..3538a58 100644
 +        if lib:
 +            return lib
 +    raise OSError("dlopen() failed to load a library: %s as %s" % (name, path))
- 
- 
+
+
  cairo = dlopen(ffi, 'cairo', 'cairo-2', 'cairo-gobject-2', 'cairo.so.2')
diff --git a/pkgs/development/python-modules/cairocffi/generic.nix b/pkgs/development/python-modules/cairocffi/generic.nix
index 4fa5cc466c31..cf1618a865b4 100644
--- a/pkgs/development/python-modules/cairocffi/generic.nix
+++ b/pkgs/development/python-modules/cairocffi/generic.nix
@@ -31,13 +31,13 @@ buildPythonPackage rec {
   '';
 
   patches = [
-    # OSError: dlopen() failed to load a library: gdk_pixbuf-2.0 / gdk_pixbuf-2.0-0
+    # OSError: dlopen() failed to load a library: gdk-pixbuf-2.0 / gdk-pixbuf-2.0-0
     (substituteAll {
       src = dlopen_patch;
       ext = stdenv.hostPlatform.extensions.sharedLibrary;
       cairo = cairo.out;
       glib = glib.out;
-      gdk_pixbuf = gdk_pixbuf.out;
+      gdk_pixbuf = gdk-pixbuf.out;
     })
     ./fix_test_scaled_font.patch
   ];
diff --git a/pkgs/development/python-modules/pyglet/default.nix b/pkgs/development/python-modules/pyglet/default.nix
index 1b00e1264ffc..b3093390e3b8 100644
--- a/pkgs/development/python-modules/pyglet/default.nix
+++ b/pkgs/development/python-modules/pyglet/default.nix
@@ -7,7 +7,7 @@
 , pytest
 , glibc
 , gtk2-x11
-, gdk_pixbuf
+, gdk-pixbuf
 }:
 
 buildPythonPackage rec {
@@ -42,7 +42,7 @@ buildPythonPackage rec {
             elif name == 'gdk-x11-2.0':
                 path = '${gtk2-x11}/lib/libgdk-x11-2.0${ext}'
             elif name == 'gdk_pixbuf-2.0':
-                path = '${gdk_pixbuf}/lib/libgdk_pixbuf-2.0${ext}'
+                path = '${gdk-pixbuf}/lib/libgdk_pixbuf-2.0${ext}'
             if path is not None:
                 return ctypes.cdll.LoadLibrary(path)
         raise Exception("Could not load library {}".format(names))
diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index eb136d4c2435..4e9bd0538a9d 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -22,7 +22,7 @@
 , pkgconfig , ncurses, xapian_1_2_22, gpgme, utillinux, fetchpatch, tzdata, icu, libffi
 , cmake, libssh2, openssl, mysql, darwin, git, perl, pcre, gecode_3, curl
 , msgpack, qt59, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
-, cairo, re2, rake, gobject-introspection, gdk_pixbuf, zeromq, czmq, graphicsmagick, libcxx
+, cairo, re2, rake, gobject-introspection, gdk-pixbuf, zeromq, czmq, graphicsmagick, libcxx
 , file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf, fribidi, harfbuzz
 , bison, flex, pango, python3, patchelf
 , libselinux ? null, libsepol ? null
@@ -159,7 +159,7 @@ in
 
   gdk_pixbuf2 = attrs: {
     nativeBuildInputs = [ pkgconfig ];
-    buildInputs = [ rake gdk_pixbuf ];
+    buildInputs = [ rake gdk-pixbuf ];
   };
 
   gpgme = attrs: {
@@ -255,7 +255,7 @@ in
       pkgconfig
       cairo
       pango
-      gdk_pixbuf
+      gdk-pixbuf
       libxml2
       python3
     ];
diff --git a/pkgs/development/tools/node-webkit/nw12.nix b/pkgs/development/tools/node-webkit/nw12.nix
index 099e31b8d62d..57beec8f171a 100644
--- a/pkgs/development/tools/node-webkit/nw12.nix
+++ b/pkgs/development/tools/node-webkit/nw12.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, buildEnv, makeWrapper
 , xorg, alsaLib, dbus, glib, gtk2, atk, pango, freetype, fontconfig
-, gdk_pixbuf, cairo, nss, nspr, gconf, expat, systemd, libcap
+, gdk-pixbuf, cairo, nss, nspr, gconf, expat, systemd, libcap
 , libnotify}:
 let
   bits = if stdenv.hostPlatform.system == "x86_64-linux" then "x64"
@@ -9,7 +9,7 @@ let
   nwEnv = buildEnv {
     name = "nwjs-env";
     paths = [
-      xorg.libX11 xorg.libXrender glib gtk2 atk pango cairo gdk_pixbuf
+      xorg.libX11 xorg.libXrender glib gtk2 atk pango cairo gdk-pixbuf
       freetype fontconfig xorg.libXcomposite alsaLib xorg.libXdamage
       xorg.libXext xorg.libXfixes nss nspr gconf expat dbus
       xorg.libXtst xorg.libXi xorg.libXcursor xorg.libXrandr libcap
diff --git a/pkgs/development/tools/nwjs/default.nix b/pkgs/development/tools/nwjs/default.nix
index 211934080c8f..96516bfda48b 100644
--- a/pkgs/development/tools/nwjs/default.nix
+++ b/pkgs/development/tools/nwjs/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, buildEnv, makeWrapper
 
 , xorg, alsaLib, dbus, glib, gtk3, atk, pango, freetype, fontconfig
-, gdk_pixbuf, cairo, nss, nspr, gconf, expat, systemd, libcap
+, gdk-pixbuf, cairo, nss, nspr, gconf, expat, systemd, libcap
 , libnotify
 , ffmpeg, libxcb, cups
 , sqlite, udev
@@ -15,7 +15,7 @@ let
   nwEnv = buildEnv {
     name = "nwjs-env";
     paths = [
-      xorg.libX11 xorg.libXrender glib /*gtk2*/ gtk3 atk pango cairo gdk_pixbuf
+      xorg.libX11 xorg.libXrender glib /*gtk2*/ gtk3 atk pango cairo gdk-pixbuf
       freetype fontconfig xorg.libXcomposite alsaLib xorg.libXdamage
       xorg.libXext xorg.libXfixes nss nspr gconf expat dbus
       xorg.libXtst xorg.libXi xorg.libXcursor xorg.libXrandr
diff --git a/pkgs/development/tools/react-native-debugger/default.nix b/pkgs/development/tools/react-native-debugger/default.nix
index 97e92c3472cc..939febae693a 100644
--- a/pkgs/development/tools/react-native-debugger/default.nix
+++ b/pkgs/development/tools/react-native-debugger/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, unzip, cairo, xorg, gdk_pixbuf, fontconfig, pango, gnome2, atk, gtk2, glib
+{ stdenv, fetchurl, unzip, cairo, xorg, gdk-pixbuf, fontconfig, pango, gnome2, atk, gtk2, glib
 , freetype, dbus, nss, nspr, alsaLib, cups, expat, udev, makeDesktopItem
 }:
 
@@ -6,7 +6,7 @@ let
   rpath = stdenv.lib.makeLibraryPath [
     cairo
     stdenv.cc.cc
-    gdk_pixbuf
+    gdk-pixbuf
     fontconfig
     pango
     atk
diff --git a/pkgs/development/tools/selenium/chromedriver/default.nix b/pkgs/development/tools/selenium/chromedriver/default.nix
index 50aad7a013a9..178bfc2dc178 100644
--- a/pkgs/development/tools/selenium/chromedriver/default.nix
+++ b/pkgs/development/tools/selenium/chromedriver/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, cairo, fontconfig, freetype, gdk_pixbuf, glib
+{ stdenv, fetchurl, cairo, fontconfig, freetype, gdk-pixbuf, glib
 , glibc, gtk2, libX11, makeWrapper, nspr, nss, pango, unzip, gconf
 , libXi, libXrender, libXext
 }:
@@ -21,7 +21,7 @@ let
   libs = stdenv.lib.makeLibraryPath [
     stdenv.cc.cc.lib
     cairo fontconfig freetype
-    gdk_pixbuf glib gtk2 gconf
+    gdk-pixbuf glib gtk2 gconf
     libX11 nspr nss pango libXrender
     gconf libXext libXi
   ];
diff --git a/pkgs/development/tools/thrust/default.nix b/pkgs/development/tools/thrust/default.nix
index 91a01edc23a6..f07451ae8404 100644
--- a/pkgs/development/tools/thrust/default.nix
+++ b/pkgs/development/tools/thrust/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, buildEnv, makeWrapper, glib, alsaLib , dbus, gtk2, atk
-, pango, freetype, fontconfig, gdk_pixbuf , cairo, cups, expat, nspr, gconf, nss
+, pango, freetype, fontconfig, gdk-pixbuf , cairo, cups, expat, nspr, gconf, nss
 , xorg, libcap, unzip
 }:
 
@@ -7,7 +7,7 @@ let
   thrustEnv = buildEnv {
     name = "env-thrust";
     paths = [
-      stdenv.cc.cc glib dbus gtk2 atk pango freetype fontconfig gdk_pixbuf
+      stdenv.cc.cc glib dbus gtk2 atk pango freetype fontconfig gdk-pixbuf
       cairo cups expat alsaLib nspr gconf nss xorg.libXrender xorg.libX11
       xorg.libXext xorg.libXdamage xorg.libXtst xorg.libXcomposite
       xorg.libXi xorg.libXfixes xorg.libXrandr xorg.libXcursor libcap
diff --git a/pkgs/development/tools/unity3d/default.nix b/pkgs/development/tools/unity3d/default.nix
index 032865be7f5f..54ace72c5fbd 100644
--- a/pkgs/development/tools/unity3d/default.nix
+++ b/pkgs/development/tools/unity3d/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchurl, makeWrapper, file, getopt
-, gtk2, gtk3, gdk_pixbuf, glib, libGL, libGLU, nss, nspr, udev, tbb
+, gtk2, gtk3, gdk-pixbuf, glib, libGL, libGLU, nss, nspr, udev, tbb
 , alsaLib, GConf, cups, libcap, fontconfig, freetype, pango
 , cairo, dbus, expat, zlib, libpng12, nodejs, gnutar, gcc, gcc_32bit
 , libX11, libXcursor, libXdamage, libXfixes, libXrender, libXi
@@ -9,12 +9,12 @@
 
 let
   libPath64 = lib.makeLibraryPath [
-    gcc.cc gtk2 gdk_pixbuf glib libGL libGLU nss nspr
+    gcc.cc gtk2 gdk-pixbuf glib libGL libGLU nss nspr
     alsaLib GConf cups libcap fontconfig freetype pango
     cairo dbus expat zlib libpng12 udev tbb
     libX11 libXcursor libXdamage libXfixes libXrender libXi
     libXcomposite libXext libXrandr libXtst libSM libICE libxcb
-    libpqxx gtk3 
+    libpqxx gtk3
   ];
   libPath32 = lib.makeLibraryPath [ gcc_32bit.cc ];
   binPath = lib.makeBinPath [ nodejs gnutar ];
@@ -82,7 +82,7 @@ in stdenv.mkDerivation rec {
     }
 
     upm_linux=$unitydir/Data/Resources/PackageManager/Server/UnityPackageManager
-    
+
 
     orig_size=$(stat --printf=%s $upm_linux)
 
@@ -102,7 +102,7 @@ in stdenv.mkDerivation rec {
     # ^-- grep points here
     #
     # var_* are as described above
-    # shift_by seems to be safe so long as all patchelf adjustments occur 
+    # shift_by seems to be safe so long as all patchelf adjustments occur
     # before any locations pointed to by hardcoded offsets
 
     var_skip=20
diff --git a/pkgs/development/web/insomnia/default.nix b/pkgs/development/web/insomnia/default.nix
index 264f77a7fd95..26cec8f37306 100644
--- a/pkgs/development/web/insomnia/default.nix
+++ b/pkgs/development/web/insomnia/default.nix
@@ -1,6 +1,6 @@
 { stdenv, makeWrapper, fetchurl, dpkg
 , alsaLib, atk, cairo, cups, dbus, expat, fontconfig, freetype
-, gdk_pixbuf, glib, gnome2, nspr, nss, gtk3, gtk2, at-spi2-atk
+, gdk-pixbuf, glib, gnome2, nspr, nss, gtk3, gtk2, at-spi2-atk
 , gsettings-desktop-schemas, gobject-introspection, wrapGAppsHook
 , libX11, libXScrnSaver, libXcomposite, libXcursor, libXdamage, libXext
 , libXfixes, libXi, libXrandr, libXrender, libXtst, libxcb, nghttp2
@@ -25,13 +25,13 @@ in stdenv.mkDerivation rec {
     sha256 = "0km7anw5xpcfr6j7pwqhv26pk7nxv1jywqlz0lpvgj6w85aafcm3";
   };
 
-  nativeBuildInputs = [ 
+  nativeBuildInputs = [
     autoPatchelfHook
     dpkg
     makeWrapper
     gobject-introspection wrapGAppsHook
   ];
-  
+
   buildInputs = [
     alsaLib
     at-spi2-atk
@@ -42,7 +42,7 @@ in stdenv.mkDerivation rec {
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gnome2.GConf
     gnome2.pango
diff --git a/pkgs/development/web/postman/default.nix b/pkgs/development/web/postman/default.nix
index a09a84e4bf75..58b0f0e876f8 100644
--- a/pkgs/development/web/postman/default.nix
+++ b/pkgs/development/web/postman/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
       pkgs.cups
       pkgs.dbus.daemon.lib
       pkgs.expat
-      pkgs.gdk_pixbuf
+      pkgs.gdk-pixbuf
       pkgs.glib
       pkgs.gtk2-x11
       pkgs.freetype
diff --git a/pkgs/games/arena/default.nix b/pkgs/games/arena/default.nix
index 460fc049c7bf..a2a5f7b723a3 100644
--- a/pkgs/games/arena/default.nix
+++ b/pkgs/games/arena/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, gtk2-x11, glib, pango, cairo, atk, gdk_pixbuf, libX11 }:
+{ stdenv, fetchurl, gtk2-x11, glib, pango, cairo, atk, gdk-pixbuf, libX11 }:
 
 # Arena is free software in the sense of "free beer" but not as in "free
 # speech". We can install it as we please, but we cannot re-distribute it in
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   };
 
   # stdenv.cc.cc.lib is in that list to pick up libstdc++.so. Is there a better way?
-  buildInputs = [gtk2-x11 glib pango cairo atk gdk_pixbuf libX11 stdenv.cc.cc.lib];
+  buildInputs = [gtk2-x11 glib pango cairo atk gdk-pixbuf libX11 stdenv.cc.cc.lib];
 
   unpackPhase = ''
     # This is is a tar bomb, i.e. it extract a dozen files and directories to
diff --git a/pkgs/games/planetaryannihilation/default.nix b/pkgs/games/planetaryannihilation/default.nix
index 391ced362075..74e3b897a03c 100644
--- a/pkgs/games/planetaryannihilation/default.nix
+++ b/pkgs/games/planetaryannihilation/default.nix
@@ -1,5 +1,5 @@
 { stdenv, config, fetchurl, patchelf, makeWrapper, gtk2, glib, udev, alsaLib, atk
-, nspr, fontconfig, cairo, pango, nss, freetype, gnome2, gdk_pixbuf, curl, systemd, xorg }:
+, nspr, fontconfig, cairo, pango, nss, freetype, gnome2, gdk-pixbuf, curl, systemd, xorg }:
 
 # TODO: use dynamic attributes once Nix 1.7 is out
 assert ((config.planetary_annihilation or null).url or null) != null;
@@ -23,7 +23,7 @@ stdenv.mkDerivation {
   };
 
   nativeBuildInputs = [ patchelf makeWrapper ];
- 
+
   installPhase = ''
     mkdir -p $out/{bin,lib}
 
@@ -34,7 +34,7 @@ stdenv.mkDerivation {
     ln -s ${systemd}/lib/libudev.so.1 $out/lib/libudev.so.0
 
     patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" "$out/PA"
-    patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" --set-rpath "${stdenv.lib.makeLibraryPath [ stdenv.cc.cc.lib xorg.libXdamage xorg.libXfixes gtk2 glib stdenv.glibc.out "$out" xorg.libXext pango udev xorg.libX11 xorg.libXcomposite alsaLib atk nspr fontconfig cairo pango nss freetype gnome2.GConf gdk_pixbuf xorg.libXrender ]}:{stdenv.cc.cc.lib}/lib64:${stdenv.glibc.out}/lib64" "$out/host/CoherentUI_Host"
+    patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" --set-rpath "${stdenv.lib.makeLibraryPath [ stdenv.cc.cc.lib xorg.libXdamage xorg.libXfixes gtk2 glib stdenv.glibc.out "$out" xorg.libXext pango udev xorg.libX11 xorg.libXcomposite alsaLib atk nspr fontconfig cairo pango nss freetype gnome2.GConf gdk-pixbuf xorg.libXrender ]}:{stdenv.cc.cc.lib}/lib64:${stdenv.glibc.out}/lib64" "$out/host/CoherentUI_Host"
 
     wrapProgram $out/PA --prefix LD_LIBRARY_PATH : "${stdenv.lib.makeLibraryPath [ stdenv.cc.cc.lib stdenv.glibc.out xorg.libX11 xorg.libXcursor gtk2 glib curl "$out" ]}:${stdenv.cc.cc.lib}/lib64:${stdenv.glibc.out}/lib64"
 
diff --git a/pkgs/games/steam/chrootenv.nix b/pkgs/games/steam/chrootenv.nix
index 3cf2d8966452..9e6bfc7bab86 100644
--- a/pkgs/games/steam/chrootenv.nix
+++ b/pkgs/games/steam/chrootenv.nix
@@ -90,7 +90,7 @@ in buildFHSUserEnv rec {
     gtk2
     bzip2
     zlib
-    gdk_pixbuf
+    gdk-pixbuf
 
     # Without these it silently fails
     xorg.libXinerama
diff --git a/pkgs/misc/emulators/cdemu/analyzer.nix b/pkgs/misc/emulators/cdemu/analyzer.nix
index a57fda56ddd4..e52cf7efc6b5 100644
--- a/pkgs/misc/emulators/cdemu/analyzer.nix
+++ b/pkgs/misc/emulators/cdemu/analyzer.nix
@@ -1,5 +1,5 @@
 { callPackage, makeWrapper, gobject-introspection, cmake
-, python3Packages, gtk3, glib, libxml2, gnuplot, gnome3, gdk_pixbuf, librsvg, intltool, libmirage }:
+, python3Packages, gtk3, glib, libxml2, gnuplot, gnome3, gdk-pixbuf, librsvg, intltool, libmirage }:
 let pkg = import ./base.nix {
   version = "3.2.2";
   pkgName = "image-analyzer";
@@ -7,7 +7,7 @@ let pkg = import ./base.nix {
 };
 in callPackage pkg {
   buildInputs = [ glib gtk3 libxml2 gnuplot libmirage makeWrapper
-                  gnome3.adwaita-icon-theme gdk_pixbuf librsvg intltool
+                  gnome3.adwaita-icon-theme gdk-pixbuf librsvg intltool
                   python3Packages.python python3Packages.pygobject3 python3Packages.matplotlib ];
   drvParams = {
     nativeBuildInputs = [ gobject-introspection cmake ];
diff --git a/pkgs/misc/emulators/cdemu/gui.nix b/pkgs/misc/emulators/cdemu/gui.nix
index 331ad0ded248..e06853b8f736 100644
--- a/pkgs/misc/emulators/cdemu/gui.nix
+++ b/pkgs/misc/emulators/cdemu/gui.nix
@@ -1,5 +1,5 @@
 { callPackage, makeWrapper, gobject-introspection, cmake
-, python3Packages, gtk3, glib, libnotify, intltool, gnome3, gdk_pixbuf, librsvg }:
+, python3Packages, gtk3, glib, libnotify, intltool, gnome3, gdk-pixbuf, librsvg }:
 let
   pkg = import ./base.nix {
     version = "3.2.1";
@@ -9,7 +9,7 @@ let
   inherit (python3Packages) python pygobject3;
 in callPackage pkg {
   buildInputs = [ python pygobject3 gtk3 glib libnotify intltool makeWrapper
-                  gnome3.adwaita-icon-theme gdk_pixbuf librsvg ];
+                  gnome3.adwaita-icon-theme gdk-pixbuf librsvg ];
   drvParams = {
     nativeBuildInputs = [ gobject-introspection cmake ];
     postFixup = ''
diff --git a/pkgs/misc/emulators/epsxe/default.nix b/pkgs/misc/emulators/epsxe/default.nix
index 5fee8b4b83d4..edf4fe017a2e 100644
--- a/pkgs/misc/emulators/epsxe/default.nix
+++ b/pkgs/misc/emulators/epsxe/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, alsaLib, curl, gdk_pixbuf, glib, gtk3, libGLU_combined,
+{ stdenv, fetchurl, alsaLib, curl, gdk-pixbuf, glib, gtk3, libGLU_combined,
   libX11, openssl, ncurses5, SDL, SDL_ttf, unzip, zlib, wrapGAppsHook }:
 
 with stdenv.lib;
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     alsaLib
     curl
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gtk3
     libX11
diff --git a/pkgs/misc/emulators/kega-fusion/default.nix b/pkgs/misc/emulators/kega-fusion/default.nix
index 01785bd9a27e..32d3013d842c 100644
--- a/pkgs/misc/emulators/kega-fusion/default.nix
+++ b/pkgs/misc/emulators/kega-fusion/default.nix
@@ -1,7 +1,7 @@
-{ stdenv, lib, writeText, fetchurl, upx, libGLU, glib, gtk2, alsaLib, libSM, libX11, gdk_pixbuf, pango, libXinerama, mpg123, runtimeShell }:
+{ stdenv, lib, writeText, fetchurl, upx, libGLU, glib, gtk2, alsaLib, libSM, libX11, gdk-pixbuf, pango, libXinerama, mpg123, runtimeShell }:
 
 let
-  libPath = lib.makeLibraryPath [ stdenv.cc.cc libGLU glib gtk2 alsaLib libSM libX11 gdk_pixbuf pango libXinerama ];
+  libPath = lib.makeLibraryPath [ stdenv.cc.cc libGLU glib gtk2 alsaLib libSM libX11 gdk-pixbuf pango libXinerama ];
 
 in stdenv.mkDerivation rec {
   name = "kega-fusion-${version}";
diff --git a/pkgs/misc/emulators/nestopia/default.nix b/pkgs/misc/emulators/nestopia/default.nix
index 9eb353ede583..5bc7bcec9d41 100644
--- a/pkgs/misc/emulators/nestopia/default.nix
+++ b/pkgs/misc/emulators/nestopia/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, pkgconfig, SDL2, alsaLib, gtk3
 , makeWrapper, libGLU_combined, libarchive, libao, unzip, xdg_utils
-, epoxy, gdk_pixbuf, gnome3, wrapGAppsHook
+, epoxy, gdk-pixbuf, gnome3, wrapGAppsHook
 }:
 
 stdenv.mkDerivation rec {
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
     alsaLib
     epoxy
     gtk3
-    gdk_pixbuf
+    gdk-pixbuf
     libGLU_combined
     libarchive
     libao
diff --git a/pkgs/misc/solfege/default.nix b/pkgs/misc/solfege/default.nix
index 4fef8d080434..7ca9843e2e35 100644
--- a/pkgs/misc/solfege/default.nix
+++ b/pkgs/misc/solfege/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, pythonPackages, gettext, texinfo
-, ghostscript, librsvg, gdk_pixbuf, txt2man, timidity, mpg123
+, ghostscript, librsvg, gdk-pixbuf, txt2man, timidity, mpg123
 , alsaUtils, vorbis-tools, csound, lilypond
 , makeWrapper
 }:
@@ -16,7 +16,7 @@ in stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ python pygtk gettext texinfo
-    ghostscript librsvg gdk_pixbuf txt2man makeWrapper
+    ghostscript librsvg gdk-pixbuf txt2man makeWrapper
   ];
 
   preBuild = ''
diff --git a/pkgs/misc/themes/adapta/default.nix b/pkgs/misc/themes/adapta/default.nix
index cb281e68dfd7..6d2a16cbfd23 100644
--- a/pkgs/misc/themes/adapta/default.nix
+++ b/pkgs/misc/themes/adapta/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, parallel, sassc, inkscape, libxml2, glib, gdk_pixbuf, librsvg, gtk-engine-murrine, gnome3 }:
+{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, parallel, sassc, inkscape, libxml2, glib, gdk-pixbuf, librsvg, gtk-engine-murrine, gnome3 }:
 
 stdenv.mkDerivation rec {
   name = "adapta-gtk-theme-${version}";
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    gdk_pixbuf
+    gdk-pixbuf
     librsvg
   ];
 
diff --git a/pkgs/misc/themes/equilux-theme/default.nix b/pkgs/misc/themes/equilux-theme/default.nix
index 66e886303421..bc4b57e8b58e 100644
--- a/pkgs/misc/themes/equilux-theme/default.nix
+++ b/pkgs/misc/themes/equilux-theme/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, gnome3, glib, libxml2, gtk-engine-murrine, gdk_pixbuf, librsvg, bc }:
+{ stdenv, fetchFromGitHub, gnome3, glib, libxml2, gtk-engine-murrine, gdk-pixbuf, librsvg, bc }:
 
 stdenv.mkDerivation rec {
   name = "equilux-theme-${version}";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ glib libxml2 bc ];
 
-  buildInputs = [ gnome3.gnome-themes-extra gdk_pixbuf librsvg ];
+  buildInputs = [ gnome3.gnome-themes-extra gdk-pixbuf librsvg ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/misc/themes/numix-solarized/default.nix b/pkgs/misc/themes/numix-solarized/default.nix
index 3c81e4308ca9..97a018f929e3 100644
--- a/pkgs/misc/themes/numix-solarized/default.nix
+++ b/pkgs/misc/themes/numix-solarized/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, python3, sass, glib, gdk_pixbuf, libxml2,
+{ stdenv, fetchFromGitHub, python3, sass, glib, gdk-pixbuf, libxml2,
   inkscape, optipng, gtk-engine-murrine
 }:
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     sha256 = "0l4xvsiyg15kp6xwpvm3jckxyhr1lxd678lkhrcyf40n7rd4xinl";
   };
 
-  nativeBuildInputs = [ python3 sass glib gdk_pixbuf libxml2 inkscape optipng ];
+  nativeBuildInputs = [ python3 sass glib gdk-pixbuf libxml2 inkscape optipng ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/misc/themes/numix/default.nix b/pkgs/misc/themes/numix/default.nix
index 4fb412481095..eb4b8c76301b 100644
--- a/pkgs/misc/themes/numix/default.nix
+++ b/pkgs/misc/themes/numix/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, sass, glib, libxml2, gdk_pixbuf
+{ stdenv, fetchFromGitHub, sass, glib, libxml2, gdk-pixbuf
 , gtk-engine-murrine
 }:
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     sha256 = "12mw0kr0kkvg395qlbsvkvaqccr90cmxw5rrsl236zh43kj8grb7";
   };
 
-  nativeBuildInputs = [ sass glib libxml2 gdk_pixbuf ];
+  nativeBuildInputs = [ sass glib libxml2 gdk-pixbuf ];
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
diff --git a/pkgs/os-specific/linux/usermount/default.nix b/pkgs/os-specific/linux/usermount/default.nix
index 94e5d998cd01..5cb49485c5ba 100644
--- a/pkgs/os-specific/linux/usermount/default.nix
+++ b/pkgs/os-specific/linux/usermount/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchgit, pkgconfig, dbus, libnotify, udisks2, gdk_pixbuf }:
+{ stdenv, fetchgit, pkgconfig, dbus, libnotify, udisks2, gdk-pixbuf }:
 
 stdenv.mkDerivation {
   name = "usermount-0.1";
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
   };
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ dbus libnotify udisks2 gdk_pixbuf ];
+  buildInputs = [ dbus libnotify udisks2 gdk-pixbuf ];
 
   NIX_CFLAGS_COMPILE = [ "-DENABLE_NOTIFICATIONS" ];
 
diff --git a/pkgs/tools/X11/caffeine-ng/default.nix b/pkgs/tools/X11/caffeine-ng/default.nix
index aff7b8adfc23..57f32ed82250 100644
--- a/pkgs/tools/X11/caffeine-ng/default.nix
+++ b/pkgs/tools/X11/caffeine-ng/default.nix
@@ -1,4 +1,4 @@
-{ gdk_pixbuf, glib, gobject-introspection, gtk3, lib, libnotify,
+{ gdk-pixbuf, glib, gobject-introspection, gtk3, lib, libnotify,
   pythonPackages, wrapGAppsHook
 }:
 
@@ -12,7 +12,7 @@ pythonPackages.buildPythonApplication rec {
   };
 
   nativeBuildInputs = [ wrapGAppsHook glib ];
-  buildInputs = [ gdk_pixbuf gobject-introspection libnotify gtk3 ];
+  buildInputs = [ gdk-pixbuf gobject-introspection libnotify gtk3 ];
   pythonPath = with pythonPackages; [
     dbus-python docopt ewmh pygobject3 pyxdg
     setproctitle setuptools setuptools_scm wheel
diff --git a/pkgs/tools/X11/xpra/default.nix b/pkgs/tools/X11/xpra/default.nix
index efafbb3692ed..863c02fb23dd 100644
--- a/pkgs/tools/X11/xpra/default.nix
+++ b/pkgs/tools/X11/xpra/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchurl, callPackage, substituteAll, python3, pkgconfig
-, xorg, gtk3, glib, pango, cairo, gdk_pixbuf, atk
+, xorg, gtk3, glib, pango, cairo, gdk-pixbuf, atk
 , wrapGAppsHook, xorgserver, getopt, xauth, utillinux, which
 , ffmpeg_4, x264, libvpx, libwebp, x265
 , libfakeXinerama
@@ -40,7 +40,7 @@ in buildPythonApplication rec {
     ] ++ [
     cython
 
-    pango cairo gdk_pixbuf atk.out gtk3 glib
+    pango cairo gdk-pixbuf atk.out gtk3 glib
 
     ffmpeg_4 libvpx x264 libwebp x265
 
diff --git a/pkgs/tools/audio/gvolicon/default.nix b/pkgs/tools/audio/gvolicon/default.nix
index 4a0c244f07f7..c66c6bc1f7e0 100644
--- a/pkgs/tools/audio/gvolicon/default.nix
+++ b/pkgs/tools/audio/gvolicon/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, makeWrapper, alsaLib, pkgconfig, fetchgit, gtk3, gnome3, gdk_pixbuf, librsvg, wrapGAppsHook }:
+{ stdenv, makeWrapper, alsaLib, pkgconfig, fetchgit, gtk3, gnome3, gdk-pixbuf, librsvg, wrapGAppsHook }:
 
 stdenv.mkDerivation {
   name = "gvolicon-2014-04-28";
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
-    makeWrapper alsaLib gtk3 gdk_pixbuf gnome3.adwaita-icon-theme
+    makeWrapper alsaLib gtk3 gdk-pixbuf gnome3.adwaita-icon-theme
     librsvg wrapGAppsHook
   ];
 
diff --git a/pkgs/tools/graphics/blur-effect/default.nix b/pkgs/tools/graphics/blur-effect/default.nix
index 5bb209984396..499004013196 100644
--- a/pkgs/tools/graphics/blur-effect/default.nix
+++ b/pkgs/tools/graphics/blur-effect/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, pkgconfig, cmake, gdk_pixbuf, libGL, mesa }:
+{ stdenv, fetchFromGitHub, pkgconfig, cmake, gdk-pixbuf, libGL, mesa }:
 
 stdenv.mkDerivation rec {
   pname = "blur-effect";
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    gdk_pixbuf
+    gdk-pixbuf
     libGL
     mesa
   ];
diff --git a/pkgs/tools/inputmethods/ibus/default.nix b/pkgs/tools/inputmethods/ibus/default.nix
index d2090d776762..07fa8d2beb56 100644
--- a/pkgs/tools/inputmethods/ibus/default.nix
+++ b/pkgs/tools/inputmethods/ibus/default.nix
@@ -1,5 +1,5 @@
 { stdenv, substituteAll, fetchurl, fetchFromGitHub, autoreconfHook, gettext, makeWrapper, pkgconfig
-, vala, wrapGAppsHook, dbus, dconf ? null, glib, gdk_pixbuf, gobject-introspection, gtk2
+, vala, wrapGAppsHook, dbus, dconf ? null, glib, gdk-pixbuf, gobject-introspection, gtk2
 , gtk3, gtk-doc, isocodes, python3, json-glib, libnotify ? null, enablePython2Library ? false
 , enableUI ? true, withWayland ? false, libxkbcommon ? null, wayland ? null
 , buildPackages, runtimeShell }:
@@ -134,7 +134,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     dbus
     dconf
-    gdk_pixbuf
+    gdk-pixbuf
     gobject-introspection
     python3.pkgs.pygobject3 # for pygobject overrides
     gtk2
diff --git a/pkgs/tools/misc/birdfont/default.nix b/pkgs/tools/misc/birdfont/default.nix
index 2de6715db8fe..56e7650673e1 100644
--- a/pkgs/tools/misc/birdfont/default.nix
+++ b/pkgs/tools/misc/birdfont/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, python3, xmlbird,
-cairo, gdk_pixbuf, libgee, glib, gtk3, webkitgtk, libnotify, sqlite, vala,
+cairo, gdk-pixbuf, libgee, glib, gtk3, webkitgtk, libnotify, sqlite, vala,
 gobject-introspection, gsettings-desktop-schemas, wrapGAppsHook }:
 
 stdenv.mkDerivation rec {
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ python3 pkgconfig vala gobject-introspection wrapGAppsHook ];
-  buildInputs = [ xmlbird libgee cairo gdk_pixbuf glib gtk3 webkitgtk libnotify sqlite gsettings-desktop-schemas ];
+  buildInputs = [ xmlbird libgee cairo gdk-pixbuf glib gtk3 webkitgtk libnotify sqlite gsettings-desktop-schemas ];
 
   postPatch = "patchShebangs .";
 
diff --git a/pkgs/tools/misc/staruml/default.nix b/pkgs/tools/misc/staruml/default.nix
index dcbee0e343ec..794c06b8044e 100644
--- a/pkgs/tools/misc/staruml/default.nix
+++ b/pkgs/tools/misc/staruml/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, makeWrapper
 , dpkg, patchelf
-, gtk2, glib, gdk_pixbuf, alsaLib, nss, nspr, GConf, cups, libgcrypt, dbus, systemd
+, gtk2, glib, gdk-pixbuf, alsaLib, nss, nspr, GConf, cups, libgcrypt, dbus, systemd
 , libXdamage, expat }:
 
 let
   inherit (stdenv) lib;
   LD_LIBRARY_PATH = lib.makeLibraryPath
-    [ glib gtk2 gdk_pixbuf alsaLib nss nspr GConf cups libgcrypt dbus libXdamage expat ];
+    [ glib gtk2 gdk-pixbuf alsaLib nss nspr GConf cups libgcrypt dbus libXdamage expat ];
 in
 stdenv.mkDerivation rec {
   version = "2.8.1";
diff --git a/pkgs/tools/misc/sweep-visualizer/default.nix b/pkgs/tools/misc/sweep-visualizer/default.nix
index cbf849494b75..fd0a766f54e9 100644
--- a/pkgs/tools/misc/sweep-visualizer/default.nix
+++ b/pkgs/tools/misc/sweep-visualizer/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, makeWrapper, fetchurl,
-  alsaLib, atk, cairo, cups, dbus, expat, fontconfig, freetype, gdk_pixbuf, glib,
+  alsaLib, atk, cairo, cups, dbus, expat, fontconfig, freetype, gdk-pixbuf, glib,
   gnome2, gtk2-x11, nspr, nss,
   libX11, libxcb, libXcomposite, libXcursor, libXdamage, libXext, libXfixes,
   libXi, libXrandr, libXrender, libXScrnSaver, libXtst,
@@ -13,7 +13,7 @@
       url = "https://s3.amazonaws.com/scanse/Visualizer/v${version}/sweepvisualizer_${version}_amd64.deb";
       sha256 = "1k6rdjw2340qrzafv6hjxvbvyh3s1wad6d3629nchdcrpyx9xy1c";
     };
-    
+
     nativeBuildInputs = [ makeWrapper ];
 
     sourceRoot = ".";
@@ -32,8 +32,8 @@
 
     preFixup = let
       libPath = lib.makeLibraryPath [
-        alsaLib atk cairo cups.lib dbus.lib expat fontconfig.lib freetype 
-        gdk_pixbuf glib gnome2.GConf gnome2.pango gtk2-x11 nspr nss stdenv.cc.cc.lib
+        alsaLib atk cairo cups.lib dbus.lib expat fontconfig.lib freetype
+        gdk-pixbuf glib gnome2.GConf gnome2.pango gtk2-x11 nspr nss stdenv.cc.cc.lib
         libX11 libxcb libXcomposite libXcursor libXdamage libXext libXfixes
         libXi libXrandr libXrender libXScrnSaver libXtst
       ];
diff --git a/pkgs/tools/misc/system-config-printer/default.nix b/pkgs/tools/misc/system-config-printer/default.nix
index 025833431176..6750bbe8ae69 100644
--- a/pkgs/tools/misc/system-config-printer/default.nix
+++ b/pkgs/tools/misc/system-config-printer/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, udev, intltool, pkgconfig, glib, xmlto, wrapGAppsHook
 , docbook_xml_dtd_412, docbook_xsl
-, libxml2, desktop-file-utils, libusb1, cups, gdk_pixbuf, pango, atk, libnotify
+, libxml2, desktop-file-utils, libusb1, cups, gdk-pixbuf, pango, atk, libnotify
 , gobject-introspection, libsecret
 , cups-filters
 , pythonPackages
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     glib udev libusb1 cups
     pythonPackages.python
-    libnotify gobject-introspection gdk_pixbuf pango atk
+    libnotify gobject-introspection gdk-pixbuf pango atk
     libsecret
   ];
 
diff --git a/pkgs/tools/networking/driftnet/default.nix b/pkgs/tools/networking/driftnet/default.nix
index bf0a43ce5153..fd932617c936 100644
--- a/pkgs/tools/networking/driftnet/default.nix
+++ b/pkgs/tools/networking/driftnet/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchFromGitHub, libpcap, libjpeg , libungif, libpng
-, giflib, glib, gtk2, cairo, pango, gdk_pixbuf, atk
+, giflib, glib, gtk2, cairo, pango, gdk-pixbuf, atk
 , pkgconfig, autoreconfHook }:
 
 with lib;
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
     libpcap libjpeg libungif libpng giflib
-    glib gtk2 glib cairo pango gdk_pixbuf atk autoreconfHook
+    glib gtk2 glib cairo pango gdk-pixbuf atk autoreconfHook
   ];
 
   src = fetchFromGitHub {
diff --git a/pkgs/tools/security/encryptr/default.nix b/pkgs/tools/security/encryptr/default.nix
index 8d0c78764319..6f79be83be55 100644
--- a/pkgs/tools/security/encryptr/default.nix
+++ b/pkgs/tools/security/encryptr/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, glib, nss, nspr, gconf, fontconfig, freetype
 , pango , cairo, libX11 , libXi, libXcursor, libXext, libXfixes
 , libXrender, libXcomposite , alsaLib, libXdamage, libXtst, libXrandr
-, expat, libcap, systemd , dbus, gtk2 , gdk_pixbuf, libnotify
+, expat, libcap, systemd , dbus, gtk2 , gdk-pixbuf, libnotify
 }:
 
 let
@@ -27,7 +27,7 @@ in stdenv.mkDerivation rec {
   rpath = stdenv.lib.makeLibraryPath [
     glib nss nspr gconf fontconfig freetype pango cairo libX11 libXi
     libXcursor libXext libXfixes libXrender libXcomposite alsaLib
-    libXdamage libXtst libXrandr expat libcap dbus gtk2 gdk_pixbuf
+    libXdamage libXtst libXrandr expat libcap dbus gtk2 gdk-pixbuf
     libnotify stdenv.cc.cc
   ];
 
diff --git a/pkgs/tools/security/keybase/gui.nix b/pkgs/tools/security/keybase/gui.nix
index f84f0039347e..afe2d457a7fe 100644
--- a/pkgs/tools/security/keybase/gui.nix
+++ b/pkgs/tools/security/keybase/gui.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, alsaLib, atk, cairo, cups, udev
-, dbus, expat, fontconfig, freetype, gdk_pixbuf, glib, gtk3
+, dbus, expat, fontconfig, freetype, gdk-pixbuf, glib, gtk3
 , libnotify, nspr, nss, pango, systemd, xorg, autoPatchelfHook, wrapGAppsHook
 , runtimeShell, gsettings-desktop-schemas }:
 
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
     expat
     fontconfig
     freetype
-    gdk_pixbuf
+    gdk-pixbuf
     glib
     gsettings-desktop-schemas
     gtk3
diff --git a/pkgs/tools/system/collectd/default.nix b/pkgs/tools/system/collectd/default.nix
index 3fdc87808881..d71fa0c4e584 100644
--- a/pkgs/tools/system/collectd/default.nix
+++ b/pkgs/tools/system/collectd/default.nix
@@ -13,7 +13,7 @@
 , libmemcached, cyrus_sasl
 , libmicrohttpd
 , libmodbus
-, libnotify, gdk_pixbuf
+, libnotify, gdk-pixbuf
 , liboping
 , libpcap
 , libsigrok
@@ -59,7 +59,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig autoreconfHook ];
   buildInputs = [
     curl libdbi libgcrypt libmemcached
-    cyrus_sasl libnotify gdk_pixbuf liboping libpcap libvirt
+    cyrus_sasl libnotify gdk-pixbuf liboping libpcap libvirt
     libxml2 postgresql protobufc rrdtool
     varnish yajl jdk libtool python hiredis libmicrohttpd
     riemann_c_client mosquitto rdkafka mongoc
diff --git a/pkgs/tools/system/ddrescueview/default.nix b/pkgs/tools/system/ddrescueview/default.nix
index 517cefb6a2b3..466232e2bf77 100644
--- a/pkgs/tools/system/ddrescueview/default.nix
+++ b/pkgs/tools/system/ddrescueview/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, fpc, lazarus, atk, cairo, gdk_pixbuf, glib, gtk2, libX11, pango }:
+{ stdenv, lib, fetchurl, fpc, lazarus, atk, cairo, gdk-pixbuf, glib, gtk2, libX11, pango }:
 
 stdenv.mkDerivation rec {
   name = "ddrescueview-0.4alpha3";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ fpc lazarus ];
 
-  buildInputs = [ atk cairo gdk_pixbuf glib gtk2 libX11 pango ];
+  buildInputs = [ atk cairo gdk-pixbuf glib gtk2 libX11 pango ];
 
   sourceRoot = "source";
 
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index fd873605056b..44a27fa6c17e 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -107,6 +107,7 @@ mapAliases ({
   fuseki = apache-jena-fuseki; # added 2018-04-25
   gccApple = throw "gccApple is no longer supported"; # added 2018-04-25
   gdb-multitarget = gdb; # added 2017-11-13
+  gdk_pixbuf = gdk-pixbuf; # added 2019-05-22
   gettextWithExpat = gettext; # 2016-02-19
   git-hub = gitAndTools.git-hub; # added 2016-04-29
   glib_networking = glib-networking; # added 2018-02-25
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f7a160d14e84..2de4367a9e7b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -10883,7 +10883,7 @@ in
 
   gdata-sharp = callPackage ../development/libraries/gdata-sharp { };
 
-  gdk_pixbuf = callPackage ../development/libraries/gdk-pixbuf { };
+  gdk-pixbuf = callPackage ../development/libraries/gdk-pixbuf { };
 
   gnome-sharp = callPackage ../development/libraries/gnome-sharp { mono = mono4; };