Install qt

• Get the Qt Source Code

mkdir qt-4.8.5 && cd qt-4.8.5
git clone git://gitorious.org/qt/qt.git
cd qt
./configure

• press o to use the open source licence

• type yes to accept the licence

• Make:

make && sudo make install

or to use 10 cores to build:

make -j10 && sudo make install

• Adjust your PATH variable in your .bashrc file by adding the following line

export PATH=/usr/local/Trolltech/Qt-4.8.5/bin:$PATH