In Pyrex-0.9.1/Pyrex/Distutils/build_ext.py changing def pyrex_compile(self, source): result = Pyrex.Compiler.Main.compile(source, c_only=1) if result.num_errors <> 0: sys.exit(1) to def pyrex_compile(self, source): result = Pyrex.Compiler.Main.compile(source, c_compile=1) if result.num_errors <> 0: sys.exit(1) seems to fix it. gb