diff --git a/pkgs/development/python-modules/bcrypt/default.nix b/pkgs/development/python-modules/bcrypt/default.nix
index 89ff93e943094..93e4a7addef2a 100644
--- a/pkgs/development/python-modules/bcrypt/default.nix
+++ b/pkgs/development/python-modules/bcrypt/default.nix
@@ -5,7 +5,7 @@
   rustPlatform,
   rustc,
   setuptools,
-  setuptools-rust,
+  setuptoolsRustBuildHook,
   fetchPypi,
   pythonOlder,
   pytestCheckHook,
@@ -41,7 +41,7 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [
     setuptools
-    setuptools-rust
+    setuptoolsRustBuildHook
     rustPlatform.cargoSetupHook
     cargo
     rustc
diff --git a/pkgs/development/python-modules/contourpy/default.nix b/pkgs/development/python-modules/contourpy/default.nix
index e164297e21e79..0d27dee819230 100644
--- a/pkgs/development/python-modules/contourpy/default.nix
+++ b/pkgs/development/python-modules/contourpy/default.nix
@@ -1,14 +1,17 @@
 {
   lib,
+  buildPackages,
   buildPythonPackage,
   fetchFromGitHub,
   python,
   pythonOlder,
+  python3,
 
   # build
   meson,
   meson-python,
   ninja,
+  nukeReferences,
   pybind11,
 
   # propagates
@@ -22,7 +25,9 @@
   # tests
   matplotlib,
   pillow,
+  pytest-xdist,
   pytestCheckHook,
+  wurlitzer,
 }:
 
 let
@@ -49,6 +54,7 @@ let
     nativeBuildInputs = [
       meson
       ninja
+      nukeReferences
       pybind11
     ];
 
@@ -70,6 +76,8 @@ let
       matplotlib
       pillow
       pytestCheckHook
+      pytest-xdist
+      wurlitzer
     ];
 
     passthru.tests = {
@@ -80,6 +88,12 @@ let
 
     pythonImportsCheck = [ "contourpy" ];
 
+    # remove references to buildPackages.python3, which is not allowed for cross builds.
+    preFixup = ''
+      nuke-refs -e "${buildPackages.python3}" \
+        $out/${python3.sitePackages}/contourpy/util/{_build_config.py,__pycache__/_build_config.*}
+    '';
+
     meta = with lib; {
       changelog = "https://github.com/contourpy/contourpy/releases/tag/v${version}";
       description = "Python library for calculating contours in 2D quadrilateral grids";
diff --git a/pkgs/development/python-modules/home-assistant-chip-wheels/default.nix b/pkgs/development/python-modules/home-assistant-chip-wheels/default.nix
index 4699055253244..c3172aa90a190 100644
--- a/pkgs/development/python-modules/home-assistant-chip-wheels/default.nix
+++ b/pkgs/development/python-modules/home-assistant-chip-wheels/default.nix
@@ -32,6 +32,7 @@
   parameterized,
   pip-tools,
   pkg-config,
+  pkgconfig,
   prompt-toolkit,
   protobuf,
   psutil,
@@ -105,6 +106,7 @@ stdenv.mkDerivation rec {
     zap-chip
     # gdbus-codegen
     glib
+    pkgconfig
     python3
     # dependencies of build scripts
     click
@@ -193,6 +195,7 @@ stdenv.mkDerivation rec {
         packaging
         parameterized
         pip-tools
+        pkgconfig
         prompt-toolkit
         protobuf
         psutil
@@ -223,26 +226,18 @@ stdenv.mkDerivation rec {
         wheel
         yapf
       ];
-      depListToAttrs =
-        list:
-        builtins.listToAttrs (
-          map (dep: {
-            name = dep.name;
-            value = dep;
-          }) (lib.filter (x: x != null) list)
-        );
-      saturateDependencies =
-        deps:
-        let
-          before = deps;
-          new = lib.mergeAttrsList (
-            map (dep: depListToAttrs (dep.propagatedBuildInputs or [ ])) (lib.attrValues before)
-          );
-          after = before // new;
-        in
-        if lib.attrNames before != lib.attrNames after then saturateDependencies after else before;
-      saturateDependencyList = list: lib.attrValues (saturateDependencies (depListToAttrs list));
-      saturatedDependencyList = lib.filter (drv: drv ? dist) (saturateDependencyList dependencies);
+      filterNull = list: lib.filter (dep: dep != null) list;
+      toItem = dep: {
+        inherit dep;
+        key = dep.name;
+      };
+      saturatedDependencies = lib.genericClosure {
+        startSet = map toItem (filterNull dependencies);
+        operator = item: map toItem (filterNull ((item.dep).propagatedBuildInputs or [ ]));
+      };
+      saturatedDependencyList = lib.filter (dep: dep ? dist && dep != null) (
+        map (item: item.dep) saturatedDependencies
+      );
     in
     lib.concatMapStringsSep " " (dep: "file://${dep.dist}") saturatedDependencyList;