Setup QT via apt-get

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

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