build TBB on 10.8.2

I'm trying to build TBB on OS X following the directions in git: https://gitweb.torproject.org/torbrowser.git/blob/HEAD:/docs/buildmachine_setups/osx.txt

It doesn't appear that the docs for building are totally up to date or that they work on a 10.8.2 x86_64 Mac OS X machine.

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