How to call OpenGL functions directly?

Greetings!

I would like to use OpenGL functions directly in my code. By what I’ve seen, I could use FOpenGL name to access these functions, but I can’t include the header where that’s defined (OpenGLWindows.h, in windows, for instance).

I thought all I had to do is change the project’s .Build.cs file to also have “OpenGLDrv” in the PrivateDependencyModuleNames list. However, that didn’t work, and the compiler keeps saying it “Cannot open include file: ‘OpenGLWindows.h’: No such file or directory”.

Am I doing some really basic error I can’t see?

Thanks in advance!