Symbol not found: _objc_opt_respondsToSelector
Referenced from: /Users/USER/Desktop/teeworlds.app/Contents/MacOS/../Frameworks/libSDL2-2.0.0.dylib (which was built for Mac OS X 10.15)
objc[94503]: Class SDLApplication is implemented in both /usr/local/opt/sdl2/lib/libSDL2-2.0.0.dylib (0x102785630) and /Users/john/Desktop/teeworlds/build/./teeworlds (0x1024214b0). One of the two will be used. Which one is undefined.