python312Packages.meinheld: fix build with GCC

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

@@ -1,5 +1,7 @@
 {
   lib,
+  stdenv,
+  pythonAtLeast,
   fetchPypi,
   buildPythonPackage,
   greenlet,
@@ -10,6 +12,8 @@ buildPythonPackage rec {
   version = "1.0.2";
   format = "setuptools";
 
+  disabled = pythonAtLeast "3.13";
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "008c76937ac2117cc69e032dc69cea9f85fc605de9bac1417f447c41c16a56d6";
@@ -21,6 +25,8 @@ buildPythonPackage rec {
     substituteInPlace setup.py --replace "greenlet>=0.4.5,<0.5" "greenlet>=0.4.5"
   '';
 
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-Wno-error=implicit-function-declaration";
+
   propagatedBuildInputs = [ greenlet ];
 
   # No tests