[SDL] sdl_opengl.h

[Ryan C. Gordon]

> I am using 1.2.8 version of SDL and it does only seem to compile with 
> the gl.h and not with the sdl_opengl.h (I dont have this file on my 
> computer)... should I purchase this file? or update the sdl library?

Just update...1.2.8 is a couple years old now, there are many fixes and 
improvements since that release (and it's all free to download, no 
purchase required!)...SDL_opengl.h showed up later than 1.2.8, I think.

--ryan.