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This sounds like an issue with a MacPorts setup. On OS X, it is often necessary to run the python_select tool to use the version of Python managed by MacPorts instead.

The simplest test of your setup is:

$ python
>>> import PIL

rosrun does not alter your PYTHONPATH, and there are no modifications necessary in ROS to use a system-installed Python library. rosrun is nothing more than a convenience tool for locating executables and running them. You can verify by manually running the script instead w/o rosrun.