libsfml-dev does not exist on ArchLinux (either on official repos or AUR), but sfml and csfml are available.
But this is not the main issue here: make fails with the following error.
/home/.../ToonChess/src/ColorPicking/ColorPicking.cxx:172:24: error: ‘round’ was not declared in this scope
int selectedX = (int)round(pixel.r*8);
^~~~~
libsfml-dev does not exist on ArchLinux (either on official repos or AUR), but sfml and csfml are available.
But this is not the main issue here: make fails with the following error.
/home/.../ToonChess/src/ColorPicking/ColorPicking.cxx:172:24: error: ‘round’ was not declared in this scope
int selectedX = (int)round(pixel.r*8);
^~~~~