In case you get compilation errors about -lfreetype when compiling Qt applications in ubuntu, install the following packages.
sudo apt-get install libfreetype6-dev sudo apt-get install gobject* sudo apt-get install libxrender-dev sudo apt-get install libfontconfig-dev sudo apt-get install pthread* sudo apt-get install libpthread-stubs0-dev sudo apt-get install xext* sudo apt-get install libsm-dev
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