problems building mpkg installers for matplotlib

I am building matplotlib on an Intel Mac, and trying to use py2app to generate mpkg files. Everything seems to go well, except that when I go to install the package, it says that there is nothing to install. The package seems to be there, but is grayed out with "Skip" in the action column:

http://trichech.us/images/mpkg.png

Anyone else encounter this problem?

Thanks,

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Christopher Fonnesbeck
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