Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: LambdaHack-0.11.0.1 (user goal)
[__1] trying: LambdaHack:-jsaddle
[__2] next goal: sdl2-ttf (dependency of LambdaHack -jsaddle)
[__2] rejecting: sdl2-ttf-2.1.3, sdl2-ttf-2.1.2, sdl2-ttf-2.1.1,
sdl2-ttf-2.1.0 (conflict: pkg-config package SDL2_ttf>=2.0.12, not found in
the pkg-config database)
[__2] rejecting: sdl2-ttf-2.0.2, sdl2-ttf-2.0.1, sdl2-ttf-2.0.0 (conflict:
pkg-config package SDL2_ttf>=2.0.0, not found in the pkg-config database)
[__2] rejecting: sdl2-ttf-1.0.0, sdl2-ttf-0.2.2, sdl2-ttf-0.2.1,
sdl2-ttf-0.2.0 (conflict: LambdaHack -jsaddle => sdl2-ttf>=2)
[__2] fail (backjumping, conflict set: LambdaHack, sdl2-ttf,
LambdaHack:jsaddle)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: LambdaHack, sdl2-ttf,
LambdaHack:jsaddle