While I finish a search engine for the web, I have seen on the official forums a video of those that makes you want to experiment with your Raspi.
Spanish video: [Youtube](http://www.youtube.com/watch?v=WdA-mIvBBTw)
Link: [Beginner's guide to cross-compile Qt5 on RaspberryPi](http://qt-project.org/wiki/RaspberryPi_Beginners_guide)
Link: [Qt Blog](http://blog.qt.digia.com/)