Resolving dependencies... cabal: Could not resolve dependencies: next goal: ghci-ng (user goal) rejecting: ghci-ng-10.0.0, ghci-ng-7.6.3.5, ghci-ng-7.6.3.4 (constraint from user target requires ==7.6.3.3) trying: ghci-ng-7.6.3.3 next goal: base (dependency of ghci-ng-7.6.3.3) rejecting: base-4.9.0.0/installed-4.9... (conflict: ghci-ng => base>=4.6 && <4.7) rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires installed instance) Dependency tree exhaustively searched.