matplotlib on Ubuntu needs some dependencies before it can install w/i virtualenv

[econchick]

While in the virtualenv, sudo apt-get build-dep python-matplotlib followed by pip install matplotlib worked, not just pip install matplotlib.

http://stackoverflow.com/questions/9829175/pip-install-matplotlib-error-with-virtualenv

[merwok]

FTR aptitude build-dep (same as apt-get buld-dep but better) does not have to be run from a virtualenv.