At 02:52 PM 4/3/2008 -0400, Deron Meranda wrote:

The only thing I can think is that the system I'm installing on has a slightly different OS version. But it should be (and is) binary compatible.

Setuptools currently uses exact matching on OS strings, so that's almost certainly the problem. If you want to contribute code to do platform matching, check out the pkg_resources docs under "Platform Utilities" and then look at the code for the existing Mac OS version compatibility checking. Be sure to include tests in your patch, and the tests (as well as the version comparison code itself) must be able to run on all platforms. Feel free to ask on the list if you run into any problems/questions.