title: Error during matplotlib pip installation
body: <p>My attempts to install <code>matplotlib</code> with <code>pip</code> fail with the following error:</p>
  
  <blockquote>
    <p>Command "python setup.py egg_info" failed with error code 2 in /tmp/pip-build-P9kEsn/matplotlib/</p>
  </blockquote>
  
  <p>I am on Ubuntu 12.04.</p>