I\'m using virtualenv-1.4.5 on Mac OS X 10.6.2 (Xcode is installed) and Python 2.6. Here\'s what I get when I attempt to run a virtualenv...
Mac-Pro:pylonsd
There is a solution for this using @gregglind's fork of virtualenv. I answered to the same problem here: mac osx: unable to use virtualenv
git clone https://github.com/gregglind/virtualenv.git cd virtualenv git checkout feature/install_name_tool sudo python setup.py install