--- ./Lib/distutils/command/build_ext.py.MORE	2009-05-13 00:46:34.000000000 +0300
+++ ./Lib/distutils/command/build_ext.py	2009-05-14 23:03:50.000000000 +0300
@@ -651,7 +651,7 @@
             base = modpath[-1]
             build_py = self.get_finalized_command('build_py')
             package_dir = os.path.abspath(build_py.get_package_dir(package))
-            return os.path.join(package_dir, base)
+            return os.path.join(package_dir, self.get_ext_filename(base))
         else:
             filename = self.get_ext_filename(ext_name)
             return os.path.join(self.build_lib, filename)