Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: sdl2-fps-0.0.2 (user goal)
[__1] next goal: sdl2 (dependency of sdl2-fps)
[__1] rejecting: sdl2-2.4.0.1 (conflict: pkg-config package sdl2>=2.0.4, not
found in the pkg-config database)
[__1] rejecting: sdl2-2.4.0, sdl2-2.3.0, sdl2-2.2.0, sdl2-2.1.3.1, sdl2-2.1.3,
sdl2-2.1.2.1, sdl2-2.1.2, sdl2-2.1.1, sdl2-2.1.0, sdl2-2.0.0, sdl2-1.3.1,
sdl2-1.3.0, sdl2-1.2.0, sdl2-1.1.3, sdl2-1.1.2, sdl2-1.1.1, sdl2-1.1.0,
sdl2-1.0.2, sdl2-1.0.1, sdl2-1.0.0, sdl2-2.3.0.1 (conflict: sdl2-fps =>
sdl2>=2.4.0.1 && <2.5)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: sdl2-fps, sdl2