I installed qt 5.5.1 for windows 64bit and msvc2013 64bit and using QT Creator but everytime I compile and run a program it displays the error in opengl.h header file that 'GL/gl.h' include file not found. Ive used qt 5.5.1 32bit and vs2010 before and everything works fine. What might be the solution to this problem, help me guys.