title: Configuring PyCharm with existing virtualenv
body: <p>I am trying to get PyCharm running using existing virtualenv setting. I have pointed my PyCharm project to python interpreter in existing virtualenv ~/.virtualenvs/myproj/ in the following path</p>
  
  <p>File -> Default Settings -> Default Project -> Python Interpreter</p>
  
  <p>the project runs fine but the editor is still glowing RED on packages installed as part of the virtualenv.</p>
  
  <p>Any idea what I am missing?</p>