python310Packages.pygobject3: fix cross

pkgs/development/python-modules/pygobject/3.nix

@@ -12,6 +12,7 @@
 , ninja
 , isPy3k
 , gnome
+, python
 }:
 
 buildPythonPackage rec {
@@ -29,6 +30,10 @@ buildPythonPackage rec {
     sha256 = "HzS192JN415E61p+tCg1MoW9AwBNVRMaX39/qbkPPMk=";
   };
 
+  depsBuildBuild = [
+    pkg-config
+  ];
+
   nativeBuildInputs = [
     pkg-config
     meson
@@ -37,8 +42,9 @@ buildPythonPackage rec {
   ];
 
   buildInputs = [
-    glib
+    # # .so files link to these
     gobject-introspection
+    glib
   ] ++ lib.optionals stdenv.isDarwin [
     ncurses
   ];
@@ -48,6 +54,13 @@ buildPythonPackage rec {
     cairo
   ];
 
+  mesonFlags = [
+    # This is only used for figuring out what version of Python is in
+    # use, and related stuff like figuring out what the install prefix
+    # should be, but it does need to be able to execute Python code.
+    "-Dpython=${python.pythonForBuild.interpreter}"
+  ];
+
   passthru = {
     updateScript = gnome.updateScript {
       packageName = pname;

pkgs/top-level/python-packages.nix

@@ -7472,7 +7472,8 @@ in {
   pygobject2 = callPackage ../development/python-modules/pygobject { };
 
   pygobject3 = callPackage ../development/python-modules/pygobject/3.nix {
-    inherit (pkgs) meson;
+    # inherit (pkgs) meson won't work because it won't be spliced
+    inherit (pkgs.buildPackages) meson;
   };
 
   pygogo = callPackage ../development/python-modules/pygogo { };