Issue #14152: backport fix.

setup.py

@@ -186,7 +186,7 @@ class PyBuildExt(build_ext):
 
         # Python header files
         headers = [sysconfig.get_config_h_filename()]
-        headers += glob(os.path.join(sysconfig.get_path('platinclude'), "*.h"))
+        headers += glob(os.path.join(sysconfig.get_path('include'), "*.h"))
         for ext in self.extensions[:]:
             ext.sources = [ find_module_file(filename, moddirlist)
                             for filename in ext.sources ]