When I use the next command in my home system: $ python setup.py develop
Pyrex compiles the '.pyx' file without any problem. But after of uploading it to Pypi, and when is installed via 'easy_install' it doesn't builds any more. (I had to upload the '.c' file compiled on my system) You can see here how has been configured: http://www.bitbucket.org/ares/bcryptwrap/src/tip/setup.py and here where I had to add any files: http://www.bitbucket.org/ares/bcryptwrap/src/tip/MANIFEST.in -- http://mail.python.org/mailman/listinfo/python-list