I have installed an old version of Visual C++ (5.0) and it still provides opengl includes like gl.h, glu.h … now i am trying to use opengl 1.2 features like GL_CLAMP_TO_EDGE but it is not defined in the include file…where I can get the latest version of the opengl includes?

look for glext.h, its some where on this site, and I think most video card manufacturers have one as well

glext.h and wglext.h are available at the Extension Registry :