Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: spade-0.1.0.8 (user goal)
[__1] next goal: sdl2-mixer (dependency of spade)
[__1] rejecting: sdl2-mixer-1.2.0.0, sdl2-mixer-1.1.0, sdl2-mixer-0.1
(conflict: pkg-config package SDL2_mixer>=2.0.0, not found in the pkg-config
database)
[__1] fail (backjumping, conflict set: sdl2-mixer, spade)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: sdl2-mixer, spade