Resolving dependencies... cabal: Could not resolve dependencies: next goal: plugins (user goal) rejecting: plugins-1.5.5.0, plugins-1.5.4.0, plugins-1.5.3.0, plugins-1.5.2.3, plugins-1.5.2.2, plugins-1.5.2.1, plugins-1.5.1.4, plugins-1.5.1.3, plugins-1.5.1.2, plugins-1.5.1.1, plugins-1.5.1, plugins-1.4.1 (constraint from user target requires ==1.4.0) trying: plugins-1.4.0 next goal: base (dependency of plugins-1.4.0) rejecting: base-4.9.0.0/installed-4.9... (conflict: plugins => base>=4 && <4.3) 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.