Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: sdl2 (user goal)
[__0] rejecting: sdl2-2.5.3.0 (conflict: pkg-config package sdl2==2.0.6 ||
>2.0.6, not found in the pkg-config database)
[__0] rejecting: sdl2-2.5.2.0, sdl2-2.5.1.0, sdl2-2.5.0.0, sdl2-2.4.1.0,
sdl2-2.4.0.1, 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 (constraint from user target
requires ==2.5.3.0)
[__0] fail (backjumping, conflict set: sdl2)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: sdl2