"cannot import name rcParams"

I have a strange problem with my builds of matplotlib on OS X 10.4: If I install them from the command line, with setup.py, they install fine and matplotlib can be imported with no problem. However, I need to build distributable OS X packages, which I do using bdist_mpkg; when this package is installed, I get an error when importing pylab:

from pylab import *

Traceback (most recent call last):

File “”, line 1, in

File “/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/pylab.py”, line 1, in

from matplotlib.pylab import *

File “/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/pylab.py”, line 199, in

import cm

File “/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/cm.py”, line 5, in

import colors

File “/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/colors.py”, line 38, in

from numerix import array, arange, take, put, Float, Int, putmask, \

File “/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/numerix/init.py”, line 20, in

from matplotlib import rcParams, verbose

ImportError: cannot import name rcParams

I would appreciate any help to resolve this issue.