I got the same message about Zope.
I don't remember how I got past it.

I have Zope 4.0.5 in this location:
/Library/Python/2.7/site-packages/zope.interface-4.0.5-py2.7-macosx-10.8-intel.egg
I don't remember what an egg is though
I remember Google does.

Somehow I was able to install it.
Many hours of Googling ...

Perhaps upgrading Python 2.7 did it.

What version of Python is currently installed?
I remember a version is part of 10.8.5.