[Twisted-Python] qtreactor and OSX

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I have a program that uses QT and twisted. I've had no problem  
running it on a Linux machine, but when I moved it over to a Mac, I  
get the following error:

Traceback (most recent call last):
   File "cursor_test.py", line 8, in <module>
     from twisted.internet import qtreactor
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/ 
python2.5/site-packages/twisted/internet/qtreactor.py", line 7, in  
<module>
     from twisted.plugins.qtreactor_stub import errorMessage
ImportError: No module named qtreactor_stub


When I look in /Library/Frameworks/Python.framework/Versions/2.5/lib/ 
python2.5/site-packages/twisted/plugins, qtreactor_stub.py is indeed  
not present. Has anyone seen this before and can tell me what is  
going on here?

Any guidance would be appreciated...
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