Python2 Virtualenv

The Python2 virtual environment module. The super-build will create a virtualenv to install and use needed Python modules.

System Package
BSD Ports devel/py-virtualenv*
Debian/Ubuntu python-virtualenv†
Fedora python-virtualenv
Homebrew N/A (use pip‡)
RedHat/CentOS python-virtualenv
*
If using pkg, install py27-virtualenv.
Do not confuse with the virtualenv package, which is the virtualenv command, not the Python module, and will not be sufficient.
Run /usr/local/bin/python2 -m pip install virtualenv.

Use pip install virtualenv if a packaged version is not available, or if you want a current version.