title: How do you specify bin directory for pip install with --target option enabled
body: <p>To give an example, if I run the command</p>
  
  <pre><code>sudo pip install gunicorn
  </code></pre>
  
  <p>There's now a file</p>
  
  <pre><code>/usr/local/bin/gunicorn
  </code></pre>
  
  <p>and a folder</p>
  
  <pre><code>/usr/local/lib/python2.7/site-packages/gunicorn
  </code></pre>
  
  <p>And I can run "gunicorn" from the shell.</p>
  
  <p>However, if I run the command</p>
  
  <pre><code>sudo pip install gunicorn --target=~/tmp_directory
  </code></pre>
  
  <p>There's a folder at </p>
  
  <pre><code> ~/tmp_directory/gunicorn
  </code></pre>
  
  <p>However, there is no "bin/gunicorn" anywhere and I cannot run "gunicorn" from the shell.  Looking through the pip documentation I can't find anything for this particular case.  The exact reason for my doing this is to try and setup a custom buildpack on Heroku.</p>