I know this is an old post, but this is fixed now if you use

sudo easy_install virtualenv==dev

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Good thing Lion's out. Snow Leopard had some pretty serious performance issues.

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So there I was, merrily plooking along with my various Python projects and had occasion to make a new virtual environment using `mkvirtualenv` from Doug Hellmann’s excellent.

Poked around in the source looking for a clue for a minute, then did the obvious; Googled for the error message.

Fortunately, Python provides you with a way to create throw-away "virtual private Pythons" into which you can install third-party software of unknown quality, test it, throw the virtual Python away when you are satisfied, and start over with as many clean new virtual Pythons as you like. This procedure gets you set up to do just that.

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