Resolving dependencies...
cabal: Could not resolve dependencies:
trying: reflex-sdl2-0.1.0.0 (user goal)
trying: base-4.9.1.0/installed-4.9... (dependency of reflex-sdl2-0.1.0.0)
next goal: reflex (dependency of reflex-sdl2-0.1.0.0)
rejecting: reflex-0.4.0, reflex-0.3.2, reflex-0.3.1, reflex-0.3, reflex-0.2,
reflex-0.1.1, reflex-0.1.0, reflex-0.0.1 (conflict:
base==4.9.1.0/installed-4.9..., reflex => base>=4.7 && <4.9)
Dependency tree exhaustively searched.