Resolving dependencies... cabal: Could not resolve dependencies: next goal: MFlow (user goal) rejecting: MFlow-0.4.6.0, MFlow-0.4.5.13, MFlow-0.4.5.12, MFlow-0.4.5.11, MFlow-0.4.5.10, MFlow-0.4.5.9, MFlow-0.4.5.8, MFlow-0.4.5.7, MFlow-0.4.5.6, MFlow-0.4.5.5, MFlow-0.4.5.4, MFlow-0.4.5.3, MFlow-0.4.5.2, MFlow-0.4.5.1, MFlow-0.4.5, MFlow-0.4.4, MFlow-0.4.2, MFlow-0.4.1, MFlow-0.4.0, MFlow-0.3.3, MFlow-0.3.2.0, MFlow-0.3.1.1, MFlow-0.3.1.0, MFlow-0.3.0.2, MFlow-0.3.0.1, MFlow-0.3.0.0, MFlow-0.2.0.9, MFlow-0.2.0.8, MFlow-0.2.0.7, MFlow-0.2.0.6, MFlow-0.2.0.5, MFlow-0.2.0.4, MFlow-0.2.0.3, MFlow-0.2.0.2, MFlow-0.2.0.1, MFlow-0.2.0.0, MFlow-0.1.5.5, MFlow-0.1.5.4, MFlow-0.1.5.3, MFlow-0.1.5.2, MFlow-0.1.5.1, MFlow-0.1.5.0, MFlow-0.0.5.3 (constraint from user target requires ==0.0.5.2) trying: MFlow-0.0.5.2 next goal: base (dependency of MFlow-0.0.5.2) rejecting: base-4.9.0.0/installed-4.9... (conflict: MFlow => base>4.0 && <4.6) 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.