title: pip: command 'install' has no such option 'pre_commands'
body: <p>I have this error when running any <code>pip install [--user] &lt;package&gt;</code> or <code>virtualenv &lt;path&gt;</code> command in a specific directory:</p>
  
  <pre><code>DistutilsOptionError: error in setup.cfg: command 'install' has no such option 'pre_commands'
  </code></pre>
  
  <p>How do I fix this error and allow packages to be installed again?</p>