[Zope] Popy Problems

I'm trying, and not succeeding, to compile PoPy-2.0.6 and it won't compile (or configure, really) without mxDateTime headers...I've got the python-mxDateTime package, but not the headers...I don't get that. Can anyone help me? The exact error message is: checking for mxDateTime.h... no configure: error: PoPy needs mxDateTime headers Thanks! Russell