title: SSL backend error when using OpenSSL
body: <p>I was trying to install pycurl in a virtualenv using pip and I got this error </p>
  
  <pre><code>ImportError: pycurl: libcurl link-time ssl backend (openssl) is different from compile-time ssl backend (none/other)
  </code></pre>
  
  <p>I read some documentation saying that <em>"To fix this, you need to tell setup.py what SSL backend is used"</em> <a href="https://github.com/pycurl/pycurl">(source)</a> although I am not sure how to do this since I installed pycurl using pip.</p>
  
  <p>How can I specify the SSL backend when installing pycurl with pip?</p>
  
  <p>Thanks</p>