To setup qt4 $ sudo apt-get install qt4-dev-tools libqt4-dev libqt4-core libqt4-gui qt4-demos qtcreator qtcreator-dbg qtcreator-doc The demos should locate in /usr/lib/qt4/demos also examples Here is the great reference of setup qt4 http://ashu-geek.blogspot.com/2012/03/qt-47-cross-platform-application-ui.html
i have found problem that i can't change font (thai font) in skype on fedora 12 for who havn't qt4-setting in system>>preference please use qtconfig-gq4 in commandline instead then change font to "Loma" very thank to this tread (http://forums.fedoraforum.org/showthread.php?t=223708)