Resolving dependencies... cabal: Could not resolve dependencies: trying: plot-lab-0.0.1.9 (user goal) next goal: base (dependency of plot-lab-0.0.1.9) rejecting: base-4.8.1.0/installed-4f7... (conflict: plot-lab => base>=4.7 && <4.8) 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.