django not found problem in mac - eclipse - pydev

I am using mac air now (I still love ubuntu). I have installed django, eclipse, pydev in my Mac OS X. Then I tried to create a new django project in eclipse and got the error "django not found". Is says that it failed to import django. But in my terminal, I can import django with no problem:
>>> import django
>>> 
This was a bit confusing at the beginning. Then I found that I need to add a new path in the eclipse > preference > pydev > interpreter-python (just add the directory where I unzipped Django-1.4.1.tar.gz). 

You can follow this blog post for step by step installation instructions.

Update: This stackoverflow post - Why doesn't Pydev Find Django discuss the same issue.

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