New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/25455#issuecomment-706483416

Comment:
> I tried to do this... I ran into problems.
> 
> `gtkglextmm` has a corresponding API to `gtkglext`'s `gtkglfont` api that needs to be killed off too.

~Which one? I couldn't find that~ Found it.
I don't know the reason but the build succeed.
I guess we can left it there for now.

> Furthermore `ufoairadiant` breaks with this change as it has an internal library that links against `gtkglfont` for font rendering in `ufoairadiant`.

Let me see.

> 
> This patch fixes the `glOrthof` stuff:
> 
> ```
> SDL_opengl.h dosen't have the nessecary headers. GL/gl.h has the parts
> of SDL_opengl.h needed for SDL_opengl_glext.h, then include
> SDL_opengl_glext.h which has the *f functions.
> 
> --- src/client/renderer/r_gl.h  2020-10-08 07:50:29.818581990 +1100
> +++ src/client/renderer/r_gl.h  2020-10-08 07:52:16.805006133 +1100
> @@ -29,7 +29,8 @@
>  #include "../../ports/android/r_gles_android.h"
>  #include <stdlib.h>
>  #else
> -#include <SDL_opengl.h>
> +#include <GL/gl.h>
> +#include <SDL_opengl_glext.h>
>  #endif
> 
>  inline void R_DrawArrays (GLint first, GLsizei count) {
> ```

Excellent! Thanks,


> `src/tools/radiant/libs/gtkutil/glfont.cpp` is the one that uses glfont.