title: Get fatal error when install psycopg2
body: <p>I created a virtual environment with virtualenvwrapper using Python 3.</p>
  
  <pre><code>mkvirtualenv foo -p /usr/bin/python3
  </code></pre>
  
  <p>I tried to do a <code>pip</code> install of <code>psycopg2</code> and got the following error:</p>
  
  <pre><code>./psycopg/psycopg.h:30:20: fatal error: Python.h: No such file or directory
  </code></pre>
  
  <p>I have the most recent version of <code>python-dev</code>.  I can successfully install <code>psycopg2</code> with a virtualenv using Python 2.</p>
  
  <p>What is the trick to getting it install in a virtualenv using Python 3?</p>