title: PySide / Shiboken compile error raised during cmake
body: <p>I'm trying to install the new version of PySide (1.2.~) on an OS X 10.7.5 system in a virtualenv.</p>
  
  <p>I'm following the commands posted on github page however during compile I get this error:</p>
  
  <pre><code>/opt/local/include/QtCore/qnamespace.h:9:10: fatal error: '../QtCore/qnamespace.h' file not found
  </code></pre>
  
  <p>and then installation/compile stops saying:</p>
  
  <pre><code>make: *** [all] Error 2
  error: Error compiling shiboken
  </code></pre>
  
  <p>How can I install PySide and overcome this problem?</p>