Resolving dependencies...
cabal: Could not resolve dependencies:
trying: yampa-sdl2-0.0.2.0 (user goal)
next goal: sdl2-gfx (dependency of yampa-sdl2-0.0.2.0)
rejecting: sdl2-gfx-0.2 (conflict: requires pkg-config package sdl2>=2.0.3,
not found in the pkg-config database)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: yampa-sdl2, sdl2-gfx