Load all on xcode...

Qt Code: 
  1. qmake -spec macx-xcode *name*.pro
To copy to clipboard, switch view to plain text mode 


And choise universal from flag.
Picture from
http://www.qtforum.de/forum/viewtopic.php?t=2452
and you can better view error ...

Other helpful tip from:
http://www.osxentwicklerforum.de/hmportal.php
If you can german...