title: virtualenv not working on Mac OSX 10.11 El Capitan
body: <p>I try to create a virtualenv but if fails. I searched at Google and at Stackoverflow but I found nothing helpful. Maybe someone can point me to an answer? </p>
  
  <p>Thanks for your help</p>
  
  <p>I'm using:</p>
  
  <ul>
  <li>python 2.7.10</li>
  <li>virtualenv 13.1.2</li>
  <li>pip 7.1.2</li>
  <li>Mac OSX 10.11 (El Capitan)</li>
  </ul>
  
  <p>Log Output:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 11, in &lt;module&gt;
      sys.exit(main())
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 832, in main
      symlink=options.symlink)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 1004, in create_environment
      install_wheel(to_install, py_executable, search_dirs)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 969, in install_wheel
      'PIP_NO_INDEX': '1'
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 910, in call_subprocess
      % (cmd_desc, proc.returncode))
  </code></pre>