title: How to install lxml for PyPy?
body: <p>I've created a virtualenv for PyPy with:</p>
  
  <pre><code>virtualenv test -p `which pypy`
  source test/bin/activate
  </code></pre>
  
  <p>I installed the following dependencies:</p>
  
  <pre><code>sudo apt-get install python-dev libxml2 libxml2-dev libxslt-dev
  </code></pre>
  
  <p>And then I run:</p>
  
  <pre><code>pip install --upgrade pypy
  </code></pre>
  
  <p>As a result I get a lot of errors looking like this:</p>
  
  <pre><code>src/lxml/lxml.etree.c:234038:22: error: `PyThreadState` {aka struct _ts}` has no member named `use_tracing`
  </code></pre>
  
  <p>How do I properly install lxml for PyPy 2.6.0?</p>