title: mkvirtualenv python3.2 permission denied
body: <p>Trying to create a virtualenv using the command:</p>
  
  <pre><code>mkvirtualenv -p /usr/local/lib/python3.2 splinter
  </code></pre>
  
  <p>Gives me the response:</p>
  
  <pre><code>Running virtualenv with interpreter /usr/local/lib/python3.2
  Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 11, in &lt;module&gt;
      sys.exit(main())
    File "/usr/local/lib/python3.2/dist-packages/virtualenv.py", line 784, in main
      popen = subprocess.Popen([interpreter, file] + sys.argv[1:], env=env)
    File "/usr/lib/python3.2/subprocess.py", line 745, in __init__
      restore_signals, start_new_session)
    File "/usr/lib/python3.2/subprocess.py", line 1361, in _execute_child
      raise child_exception_type(errno_num, err_msg)
  OSError: [Errno 13] Permission denied
  </code></pre>
  
  <p>How oh how can I start a virtualenv using python3.2?</p>