pyinstall and matplotlib

Has anybody been able to create an exe of their python
applications involving matplotlib using pyinstall (ver
1.3)? I am getting a:

     RuntimeError: Could not find the matplotlib data
files

when I attempt to run the exe created.

In searching the web, it appears this is an issue when
others tried to use py2exe as well. Unfortunately,
the few hits I saw doesn't include enough details to
inspire me as to what I should be doing in my
pyinstall .spec file.

Does anybody has an example or information about this?

Thanks,

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John Henry