Why can't I run virtualenv without root?

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http://serverfault.com – I'm trying to run virtual env and all the documentation says I don't need to run it as root (and probably shouldn't). If I run it as root, everything works. If I run it without root, I get: [stats@crunch ~]$ virtualenv env Traceback (most recent call last): File "/usr/bin/virtualenv", line 5, in <module> from pkg_resources import load_entry_point File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 2655, in <module> working_set.require(__requires__) File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 648, in require needed = self.resolve(pa (HowTos)