Yet this issue is only a suggestion to extend the actual tutorial for compiling teeworlds on macOS.
It says:
Download libsdl from the http://libsdl.org and put SDL.framework in /Library/Frameworks
But this step is not enough. You should add that (if you are using homebrew) that you can install the other sdl requirements using brew install sdl2 and also tell that SDL2 is required for teeworlds.
Yet this issue is only a suggestion to extend the actual tutorial for compiling teeworlds on macOS.
It says:
But this step is not enough. You should add that (if you are using homebrew) that you can install the other sdl requirements using
brew install sdl2
and also tell that SDL2 is required for teeworlds.