python cannot see matplotlib 0.87.5

I have successfully built and installed matplotlib 0.87.5 on OS X 10.4, and both the pylab files and the matplotlib directory are in my site-packages folder. However, when I try to import matplotlib, nothing happens:

ActivePython 2.4.3 Build 11 (ActiveState Software Inc.) based on
Python 2.4.3 (#1, Apr 3 2006, 18:07:14)
[GCC 4.0.1 (Apple Computer, Inc. build 5247)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
ImportError: No module named matplotlib
>>> import pylab
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/pylab.py", line 1, in ?
     from matplotlib.pylab import *
ImportError: No module named matplotlib.pylab

This does not occur with matplotlib from cvs, nor with previous versions of matplotlib. What could be the problem here?

Thanks,

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Christopher Fonnesbeck
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