Resolving dependencies...
cabal: Could not resolve dependencies:
trying: apecs-0.2.0.1 (user goal)
next goal: sdl2 (dependency of apecs-0.2.0.1)
rejecting: sdl2-2.3.0 (conflict: requires pkg-config package sdl2>=2.0.4, not
found in the pkg-config database)
rejecting: 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 (conflict: apecs => sdl2>=2.3.0)
Dependency tree exhaustively searched.