title: Recompile files in matplotlib/src/
body: <p>I've been working with <code>matplotlib</code> source and made changes<br>
  to some <code>matplotlib/src/*.cpp</code> files.<br>
  How can I recompile those source files in order to changes take effect?</p>
  
  <p>I tried running </p>
  
  <pre><code>python3 setup.py build
  </code></pre>
  
  <p>and</p>
  
  <pre><code>python3 -mpip install -ve . 
  </code></pre>
  
  <p>as advised in <a href="https://matplotlib.org/devdocs/devel/contributing.html#installing-matplotlib-in-developer-mode" rel="nofollow noreferrer">Contributing section</a> of docs but no change observed.</p>