> I think, it is a too big task to port it.

http://www.amigabounty.net/index.php?function=viewproject&projectid=46
http://www.amigans.net/modules/xforum/viewforum.php?forum=38
http://os4depot.net/index.php?function=showfile&file=development/cross/qt.tar.gz
http://sourceforge.net/projects/qtamigaosnative/

> Maybe a guy is working on the wxWidgets porting to ng Amiga OSs

See dekanyz's posting. Project seems to be dead, though.