title: pip install reportlab error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
body: <p>use ubuntu virtualenv. I try to install reportlab</p>
  
  <p>the command is</p>
  
  <pre><code>pip install reportlab
  </code></pre>
  
  <p>in this directory</p>
  
  <pre><code>(company2)stefano@stefano-X550EP:~/htdocs/company2$
  </code></pre>
  
  <p>the error is</p>
  
  <pre><code>error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  </code></pre>
  
  <p>actually the pip list is:</p>
  
  <pre><code>argparse (1.2.1)
  Django (1.7.7)
  html5lib (0.999)
  pip (1.5.4)
  pisa (3.0.33)
  PyPDF2 (1.24)
  setuptools (2.2)
  wsgiref (0.1.2)
  xhtml2pdf (0.0.6)
  </code></pre>
  
  <p>I need reportlab to use xhtml2pdf because now the django project gives me this error:</p>
  
  <pre><code>No module named reportlab.lib.colors
  </code></pre>