Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: Allure-0.11.0.0 (user goal)
[__1] trying: LambdaHack-0.11.0.0 (dependency of Allure)
[__2] trying: LambdaHack:-jsaddle
[__3] next goal: sdl2-ttf (dependency of LambdaHack -jsaddle)
[__3] rejecting: sdl2-ttf-2.1.2, sdl2-ttf-2.1.1, sdl2-ttf-2.1.0 (conflict:
pkg-config package SDL2_ttf==2.0.12 || >2.0.12, not found in the pkg-config
database)
[__3] 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 || >2.0.0, not found in the pkg-config
database)
[__3] 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)
[__3] 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: Allure, LambdaHack, sdl2-ttf,
LambdaHack:jsaddle
Try running with --minimize-conflict-set to improve the error message.