OSX + virtualenv = missing inspect?

[gregglind]

I realize this is a bit nebulous and undermapped, but I get:

File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2318, in LoadModuleRestricted
description)
File "/Users/gregg/gits/flask-engine/libs/werkzeug/_internal.py", line 11, in
import inspect
ImportError: No module named inspect

Details:

Py27 OR Py25, running through virtualenv.

venv: $ mkvirtualenv gae --no-site-packages --distribute --python /System/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python

Running using system python (on OSX) goes fine.

(note: I am new to GAE, so I might be ignorant here!)

Suggested fix: notes in readme?