virtualenv doesn't work if nonsystem python is in path

Binary package hint: python-virtualenv

Since the first line of /usr/bin/virtualenv is #!/usr/bin/env python, virtualenv is trying to run the python I built and put into /usr/local/bin and fails since the virtualenv isn't available to that python (nor should it be). It fails with

Traceback (most recent call last):
  File "/usr/bin/virtualenv", line 2, in <module>
    import virtualenv
ImportError: No module named virtualenv

I actually know how to make things work, but /usr/bin/virtualenv should work regardless of if /usr/local/bin/python is first in my path. I'd expect it to use the system python -- what ubuntu installs should work regardless of what I put into /usr/local/bin (within reason).

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: python-virtualenv 1.4.9-3
ProcVersionSignature: Ubuntu 2.6.35-25.44-generic 2.6.35.10
Uname: Linux 2.6.35-25-generic x86_64
Architecture: amd64
Date: Fri Mar 18 14:20:46 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: python-virtualenv