Resolving dependencies... cabal: Could not resolve dependencies: next goal: LslPlus (user goal) rejecting: LslPlus-0.4.3, 0.4.2, 0.4.1.1, 0.4.1, 0.4.0, 0.3.6, 0.3.5, 0.3.4, 0.3.3, 0.3.2, 0.3.1, 0.3.0, 0.2.0, 0.1.4 (global constraint requires ==0.1.3) trying: LslPlus-0.1.3 next goal: base (dependency of LslPlus-0.1.3) rejecting: base-4.8.1.0/installed-4f7... (conflict: LslPlus => base>=4.0 && <4.1) rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires installed instance) Dependency tree exhaustively searched.