diff --git a/pkgs/applications/editors/vis/default.nix b/pkgs/applications/editors/vis/default.nix
index 72a4bfe57b89..a28890e2466f 100644
--- a/pkgs/applications/editors/vis/default.nix
+++ b/pkgs/applications/editors/vis/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
     libtermkey
     lua
     lpeg
-  ] ++ stdenv.lib.optional stdenv.isLinux [
+  ] ++ stdenv.lib.optionals stdenv.isLinux [
     acl
     libselinux
   ];
diff --git a/pkgs/development/interpreters/erlang/R16.nix b/pkgs/development/interpreters/erlang/R16.nix
index 02f9d1f98e81..ed30fe1522bf 100644
--- a/pkgs/development/interpreters/erlang/R16.nix
+++ b/pkgs/development/interpreters/erlang/R16.nix
@@ -23,9 +23,9 @@ stdenv.mkDerivation rec {
 
   buildInputs =
     [ perl gnum4 ncurses openssl makeWrapper
-    ] ++ optional wxSupport [ mesa wxGTK xorg.libX11 ]
-      ++ optional odbcSupport [ unixODBC ]
-      ++ optional stdenv.isDarwin [ Carbon Cocoa ];
+    ] ++ optionals wxSupport [ mesa wxGTK xorg.libX11 ]
+      ++ optional odbcSupport unixODBC
+      ++ optionals stdenv.isDarwin [ Carbon Cocoa ];
 
   patchPhase = '' sed -i "s@/bin/rm@rm@" lib/odbc/configure erts/configure '';
 
diff --git a/pkgs/games/residualvm/default.nix b/pkgs/games/residualvm/default.nix
index 36c40f9bec5e..e96cf5e59322 100644
--- a/pkgs/games/residualvm/default.nix
+++ b/pkgs/games/residualvm/default.nix
@@ -16,9 +16,9 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ stdenv SDL zlib libmpeg2 libmad libogg libvorbis flac alsaLib ]
-    ++ optional openglSupport [ mesa ];
+    ++ optional openglSupport mesa;
 
-  configureFlags="--enable-all-engines";
+  configureFlags = [ "--enable-all-engines" ];
 
   meta = {
     description = "Interpreter for LucasArts' Lua-based 3D adventure games";
diff --git a/pkgs/tools/graphics/gnuplot/default.nix b/pkgs/tools/graphics/gnuplot/default.nix
index 8fa7af3b1f8e..3b537fad91db 100644
--- a/pkgs/tools/graphics/gnuplot/default.nix
+++ b/pkgs/tools/graphics/gnuplot/default.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
     ++ lib.optional withTeXLive (texlive.combine { inherit (texlive) scheme-small; })
     ++ lib.optional withLua lua
     ++ lib.optionals withX [ libX11 libXpm libXt libXaw ]
-    ++ lib.optional withQt [ qt ]
+    ++ lib.optional withQt qt
     # compiling with wxGTK causes a malloc (double free) error on darwin
     ++ lib.optional (withWxGTK && !stdenv.isDarwin) wxGTK;
 
diff --git a/pkgs/tools/video/mjpegtools/default.nix b/pkgs/tools/video/mjpegtools/default.nix
index 71b1b43f6535..1ab0a9ae2738 100644
--- a/pkgs/tools/video/mjpegtools/default.nix
+++ b/pkgs/tools/video/mjpegtools/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   hardeningDisable = [ "format" ];
 
   buildInputs = [ libdv libjpeg libpng pkgconfig ]
-              ++ lib.optional (!withMinimal) [ gtk2 libX11 SDL SDL_gfx ];
+              ++ lib.optionals (!withMinimal) [ gtk2 libX11 SDL SDL_gfx ];
 
   NIX_CFLAGS_COMPILE = lib.optional (!withMinimal) "-I${SDL.dev}/include/SDL";