Resolving dependencies... cabal: Could not resolve dependencies: next goal: hen (user goal) rejecting: hen-0.1.3, 0.1.1, 0.1.0.1 (global constraint requires ==0.1.0) trying: hen-0.1.0 next goal: base (dependency of hen-0.1.0) rejecting: base-4.7.0.1/installed-e4b... (conflict: hen => base==4.6.* || ==4.5.*) rejecting: base-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.