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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 !