```
$ make
[...]
[ 48%] Building CXX object CMakeFiles/teeworlds_srv.dir/src/game/server/eventhandler.cpp.o
[ 48%] Building CXX object CMakeFiles/teeworlds.dir/src/engine/client/client.cpp.o
[ 49%] Building CXX object CMakeFiles/teeworlds.dir/src/engine/client/friends.cpp.o
In file included from /Users/chillerdragon/Desktop/git/teeworlds/src/engine/client/backend_sdl.cpp:13:
/Users/chillerdragon/Desktop/git/teeworlds/src/engine/client/backend_sdl.h:29:4: error: no matching function for...