python313Packages.mathutils: fix on python 3.13

pkgs/development/python-modules/mathutils/default.nix

···
   lib,
   buildPythonPackage,
   fetchFromGitLab,
+  pythonAtLeast,
 
   # build-system
   setuptools,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage {
   pname = "mathutils";
   version = "3.3.0";
   pyproject = true;
···
     hash = "sha256-c28kt2ADw4wHNLN0CBPcJU/kqm6g679QRaICk4WwaBc=";
   };
 
+  # error: implicit declaration of function ‘_PyLong_AsInt’; did you mean ‘PyLong_AsInt’? [-Wimplicit-function-declaration]
+  # https://github.com/python/cpython/issues/108444
+  postPatch = lib.optionalString (pythonAtLeast "3.13") ''
+    substituteInPlace src/generic/py_capi_utils.{c,h} \
+      --replace-fail "_PyLong_AsInt" "PyLong_AsInt"
+  '';
+
   build-system = [
     setuptools
   ];
 
   pythonImportsCheck = [ "mathutils" ];
 
-  meta = with lib; {
-    description = "A general math utilities library providing Matrix, Vector, Quaternion, Euler and Color classes, written in C for speed";
+  meta = {
+    description = "General math utilities library providing Matrix, Vector, Quaternion, Euler and Color classes, written in C for speed";
     homepage = "https://gitlab.com/ideasman42/blender-mathutils";
-    license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ autra ];
+    license = lib.licenses.gpl2Plus;
+    maintainers = with lib.maintainers; [ autra ];
   };
 }