Resolving dependencies... cabal: Could not resolve dependencies: next goal: hsbencher (user goal) rejecting: hsbencher-1.20.0.5, 1.20.0.3, 1.20.0.2, 1.20.0.1, 1.20, 1.14.1, 1.14, 1.12, 1.8.0.4, 1.5.3.1, 1.5.3 (global constraint requires ==1.5.1) trying: hsbencher-1.5.1 next goal: base (dependency of hsbencher-1.5.1) rejecting: base-4.8.1.0/installed-4f7... (conflict: hsbencher => base>=4.5 && <=4.7) 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.