My apologies if this was already covered; I couldn't find appropriate mention of the issue. What is the best way to require Python 2.5 in setuptools? In PyGEP 0.1.2 I did the following: setup( # --- snip --- install_requires = ['python>=2.5'], # --- snip --- ) This worked wonderfully on Linux using setuptools 0.6c5, but on Windows (also with Python 2.5 and setuptools 0.6c5), it couldn't recognize the installed version of Python and tried to download and compile it (python) from source. Granted this seems like the wrong thing to do. I was able to get things mostly working by getting rid of the install_requires line and adding this code to my setup.py: import sys if sys.version_info[:2] < (2, 5): raise Exception('PyGEP requires Python 2.5') However, easy_install will now download PyGEP for Python 2.4 and fail during setup, which is less than ideal (and ends up with cheesecaking slandering its installability ;). Am I just doing everything completely wrong? There is some more information about the error here: http://code.google.com/p/pygep/issues/detail?id=7 Thanks for your help and thanks for setuptools! -r