matplotlib/matplotlib — pull request #3032 by maciejkula (2014-05-02 14:04:30+00:00)
Title: Fix unable to find Freefont on Ubuntu 14.04

Ensure that .add_flags is called for Freefont when building from source.

Otherwise we only look in `['/usr/local/include', '/usr/include', '.']`, and none of these contain Freefont on Ubuntu 14.04.

Solves https://github.com/matplotlib/matplotlib/issues/3029.