title: Installing gevent in virtualenv
body: <p>I am just starting with virtualenv, but I am trying to install <a href="http://www.gevent.org/" rel="nofollow">gevent</a> within a virtualenv environment (I am running Windows). When I use PIP from virtualenv, I get this error:</p>
  
  <pre><code>MyEnv&gt;pip install gevent
  Downloading/unpacking gevent
    Running setup.py egg_info for package gevent
      Please provide path to libevent source with --libevent DIR
  </code></pre>
  
  <p>The package index has MSIs and EXEs for installing on Windows (http://pypi.python.org/pypi/gevent/0.13.7), but I don't know how to install those into a virtualenv environment (or if that is even possible). When I try <code>pip install gevent-0.13.7.win32-py2.7.exe</code> from the virtualenv promp, I get an error as well:</p>
  
  <pre><code>ValueError: ('Expected version spec in', 'D:\\Downloads\\gevent-0.13.7.win32-py2.7.exe', 'at', ':\\Downloads\\gevent-0.13.7.win32-py2.7.exe')
  </code></pre>
  
  <p>Does someone know how to do this?</p>