Enable global site packages in an existing virtualenv

Nowadays, virtualenv uses --no-site-packages by default. This means that the created virtualenv will not access global site-packages modules ie. /usr/lib/python2.7/site-packages/.

To enable global site-packages again, just remove this file::

your_env/lib/python2.7/no-global-site-packages.txt

Why would you do that ?

Some modules are complicated to install (xpyb) or take too much time to compile (pyqt). Using the distro packages can be pretty useful !