title: Qt5 on OSX 10.6
body: <p>I installed XCode 4.2 and Qt 5.3 at OS X 10.6 (Snow Leopard).
  When I trying to compile any project I got "Project ERROR: could not resolve SDK path for 'macosx10.8'".</p>
  
  <p>Can I change sdk version to macosx10.6 at *.pro file or something?</p>