diff --git a/nixos/modules/services/web-apps/nextcloud.nix b/nixos/modules/services/web-apps/nextcloud.nix
index 0dad85d681a9..da019aa25079 100644
--- a/nixos/modules/services/web-apps/nextcloud.nix
+++ b/nixos/modules/services/web-apps/nextcloud.nix
@@ -39,7 +39,7 @@ let
     export NEXTCLOUD_CONFIG_DIR="${cfg.home}/config"
     $sudo \
       ${phpPackage}/bin/php \
-      occ $*
+      occ "$@"
   '';
 
   inherit (config.system) stateVersion;
diff --git a/pkgs/applications/editors/kakoune/default.nix b/pkgs/applications/editors/kakoune/default.nix
index f1f811066597..67a2ac5fac77 100644
--- a/pkgs/applications/editors/kakoune/default.nix
+++ b/pkgs/applications/editors/kakoune/default.nix
@@ -25,9 +25,9 @@ stdenv.mkDerivation rec {
     export version="v${version}"
   '';
 
-  doInstallCheckPhase = true;
+  doInstallCheck = true;
   installCheckPhase = ''
-    $out/bin/kak -ui json -E "kill 0"
+    $out/bin/kak -ui json -e "kill 0"
   '';
 
   postInstall = ''
diff --git a/pkgs/applications/networking/cluster/tilt/default.nix b/pkgs/applications/networking/cluster/tilt/default.nix
index 40ba3530c8af..42de638ec42c 100644
--- a/pkgs/applications/networking/cluster/tilt/default.nix
+++ b/pkgs/applications/networking/cluster/tilt/default.nix
@@ -5,13 +5,13 @@ buildGoModule rec {
   /* Do not use "dev" as a version. If you do, Tilt will consider itself
     running in development environment and try to serve assets from the
     source tree, which is not there once build completes.  */
-  version = "0.17.13";
+  version = "0.18.1";
 
   src = fetchFromGitHub {
     owner  = "tilt-dev";
     repo   = pname;
     rev    = "v${version}";
-    sha256 = "sha256-x3U5OF8T3z9kHcYe7SwKVEKNiEsi8AEvA1rlOma4y+8=";
+    sha256 = "1sdb2x06va0j9cxdwz95dklv2csq0s596wjsjqi4sq65y9bxjr7i";
   };
   vendorSha256 = null;
 
diff --git a/pkgs/development/libraries/websocket++/default.nix b/pkgs/development/libraries/websocket++/default.nix
index 6a7b091b5367..d04cadb483b0 100644
--- a/pkgs/development/libraries/websocket++/default.nix
+++ b/pkgs/development/libraries/websocket++/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "12ffczcrryh74c1xssww35ic6yiy2l2xgdd30lshiq9wnzl2brgy";
   };
 
-  buildInputs = [ cmake ];
+  nativeBuildInputs = [ cmake ];
 
   meta = with stdenv.lib; {
     homepage = "https://www.zaphoyd.com/websocketpp/";
diff --git a/pkgs/development/python-modules/backports_unittest-mock/default.nix b/pkgs/development/python-modules/backports_unittest-mock/default.nix
index a55eeff511fe..b85c642787e6 100644
--- a/pkgs/development/python-modules/backports_unittest-mock/default.nix
+++ b/pkgs/development/python-modules/backports_unittest-mock/default.nix
@@ -13,9 +13,14 @@ buildPythonPackage rec {
 
   buildInputs = [ setuptools_scm ];
 
+  # does not contain tests
+  doCheck = false;
+  pythonImportsCheck = [ "backports.unittest_mock" ];
+
   meta = with stdenv.lib; {
     description = "Provides a function install() which makes the mock module";
     homepage = "https://github.com/jaraco/backports.unittest_mock";
     license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
   };
 }
diff --git a/pkgs/development/python-modules/pytest-black/default.nix b/pkgs/development/python-modules/pytest-black/default.nix
index 20b2483c9d16..6f23c00baf36 100644
--- a/pkgs/development/python-modules/pytest-black/default.nix
+++ b/pkgs/development/python-modules/pytest-black/default.nix
@@ -18,6 +18,8 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ black pytest toml ];
 
+  # does not contain tests
+  doCheck = false;
   pythonImportsCheck = [ "pytest_black" ];
 
   meta = with lib; {
diff --git a/pkgs/development/python-modules/pytest-mypy/default.nix b/pkgs/development/python-modules/pytest-mypy/default.nix
index 2d2a3264e741..9062284d5dfd 100644
--- a/pkgs/development/python-modules/pytest-mypy/default.nix
+++ b/pkgs/development/python-modules/pytest-mypy/default.nix
@@ -17,8 +17,13 @@ buildPythonPackage rec {
   };
 
   nativeBuildInputs = [ setuptools_scm ];
+
   propagatedBuildInputs = [ pytest mypy filelock ];
 
+  # does not contain tests
+  doCheck = false;
+  pythonImportsCheck = [ "pytest_mypy" ];
+
   meta = with lib; {
     description = "Mypy static type checker plugin for Pytest";
     homepage = "https://github.com/dbader/pytest-mypy";
diff --git a/pkgs/development/python-modules/setuptools-scm-git-archive/default.nix b/pkgs/development/python-modules/setuptools-scm-git-archive/default.nix
index 9c08871339a5..d2b464054969 100644
--- a/pkgs/development/python-modules/setuptools-scm-git-archive/default.nix
+++ b/pkgs/development/python-modules/setuptools-scm-git-archive/default.nix
@@ -14,6 +14,9 @@ buildPythonPackage rec {
 
   checkInputs = [ pytest ];
 
+  doCheck = false;
+  pythonImportsCheck = [ "setuptools_scm_git_archive" ];
+
   meta = with stdenv.lib; {
     description = "setuptools_scm plugin for git archives";
     homepage = "https://github.com/Changaco/setuptools_scm_git_archive";
diff --git a/pkgs/tools/audio/volctl/default.nix b/pkgs/tools/audio/volctl/default.nix
index 2a55015be105..1965fb083169 100644
--- a/pkgs/tools/audio/volctl/default.nix
+++ b/pkgs/tools/audio/volctl/default.nix
@@ -1,43 +1,49 @@
-{ stdenv, fetchFromGitHub, python3, libpulseaudio, glib, gtk3, gobject-introspection, wrapGAppsHook }:
+{ stdenv, python3Packages, fetchFromGitHub, wrapGAppsHook, gobject-introspection, libpulseaudio, glib, gtk3, pango, xorg }:
 
-python3.pkgs.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "volctl";
-  version = "0.6.3";
+  version = "0.8.0";
 
   src = fetchFromGitHub {
     owner = "buzz";
     repo = pname;
-    rev = version;
-    sha256 = "0rppqc5wiqxd83z2mgvhi6gdx7yhy9wnav1dbbi1wvm7lzw6fnil";
+    rev = "v${version}";
+    sha256 = "02scfscf4mdrphzrd7cbwbhpig9bhvaws8qk4zc81z8vvf3mcfv2";
   };
 
+  postPatch = ''
+    substituteInPlace volctl/lib/xwrappers.py \
+      --replace 'libXfixes.so' "${xorg.libXfixes}/lib/libXfixes.so" \
+      --replace 'libXfixes.so.3' "${xorg.libXfixes}/lib/libXfixes.so.3"
+  '';
+
+  preBuild = ''
+    export LD_LIBRARY_PATH=${libpulseaudio}/lib
+  '';
+
   nativeBuildInputs = [
     gobject-introspection
     wrapGAppsHook
   ];
 
-  buildInputs = [
-    glib
-    gtk3
-    libpulseaudio
-  ];
-
-  pythonPath = with python3.pkgs; [
+  propagatedBuildInputs = [ pango gtk3 ] ++ (with python3Packages; [
+    click
+    pycairo
     pygobject3
-  ];
+    pyyaml
+  ]);
 
+  # with strictDeps importing "gi.repository.Gtk" fails with "gi.RepositoryError: Typelib file for namespace 'Pango', version '1.0' not found"
   strictDeps = false;
 
-  preBuild = ''
-    export LD_LIBRARY_PATH=${libpulseaudio}/lib
-  '';
+  # no tests included
+  doCheck = false;
+
+  pythonImportsCheck = [ "volctl" ];
 
   preFixup = ''
     glib-compile-schemas ${glib.makeSchemaPath "$out" "${pname}-${version}"}
-
-    gappsWrapperArgs+=(
-      --prefix LD_LIBRARY_PATH : "${libpulseaudio}/lib"
-    )
+    gappsWrapperArgs+=(--prefix LD_LIBRARY_PATH : "${libpulseaudio}/lib")
   '';
 
   meta = with stdenv.lib; {
diff --git a/pkgs/tools/typesetting/tex/texlive/combine.nix b/pkgs/tools/typesetting/tex/texlive/combine.nix
index 891495c46cac..0625fe16090a 100644
--- a/pkgs/tools/typesetting/tex/texlive/combine.nix
+++ b/pkgs/tools/typesetting/tex/texlive/combine.nix
@@ -36,7 +36,7 @@ let
   mkUniqueOutPaths = pkgs: uniqueStrings
     (map (p: p.outPath) (builtins.filter lib.isDerivation pkgs));
 
-in buildEnv {
+in (buildEnv {
   name = "texlive-${extraName}-${bin.texliveYear}";
 
   extraPrefix = "/share/texmf";
@@ -271,6 +271,6 @@ in buildEnv {
   ''
     + bin.cleanBrokenLinks
   ;
-}
+}).overrideAttrs (_: { allowSubstitutes = true; })
 # TODO: make TeX fonts visible by fontconfig: it should be enough to install an appropriate file
 #       similarly, deal with xe(la)tex font visibility?