Add new, C++ class, can not find QGLWidget in Base class scroll list

Hi, I am a newbie and following opengl tutorial in below link, http://www.thasler.org/blog/?p=10 but, my Qt Creator do not showing QGLWidget in C++ Class Wizard, do I need to install something? or is there any steps that I must do before adding new class? Currently, I am working on mac os.