Ask HN: What is the SDL.h file in SuperTux?

Am looking at the repo for SuperTux as featured here in and trying to understand how the cross platform aspect works. Am I correct in my thoughts that it’s OpenGL based, using a cross platform library called Simple DirectMedia Layer aka SDL, found at

I see a frequently occurring header file called SDL.h, but when I search the repo at I can’t find it.

What is SDL.h and why am I unable to locate it?

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