--- a/Python/setup.py

+++ b/Python/setup.py

@@ -217,6 +217,7 @@ class PyBuildExt(build_ext):

             if os.path.exists(newname):

                 os.remove(newname)

             os.rename(ext_filename, newname)

+            raise

             # XXX -- This relies on a Vile HACK in

             # distutils.command.build_ext.build_extension().  The