compile on Linux, /home/suse132/Qt5.4.0/5.4/gcc_64 is the QTDIR

g++ helloqt.cpp -fPIE  -std=c++0x  -I"/home/suse132/Qt5.4.0/5.4/gcc_64/include"  -L"/home/suse132/Qt5.4.0/5.4/gcc_64/lib" -lQt5Core -lQt5Gui -lQt5Widgets  -o helloqt

or use two commands instead:

g++  -c   -fPIE  -std=c++0x  helloqt.cpp  -I"/home/suse132/Qt5.4.0/5.4/gcc_64/include" -o helloqt.o 

g++  helloqt.o  -L"/home/suse132/Qt5.4.0/5.4/gcc_64/lib" -lQt5Core -lQt5Gui -lQt5Widgets  -o helloqt