Resolving dependencies... cabal: Could not resolve dependencies: next goal: happstack-server (user goal) rejecting: happstack-server-7.4.5, 7.4.4, 7.4.3, 7.4.2, 7.4.1, 7.4.0, 7.3.9, 7.3.8, 7.3.7, 7.3.6, 7.3.5, 7.3.4, 7.3.3, 7.3.2, 7.3.1, 7.3.0, 7.1.7.1, 7.1.7, 7.1.6, 7.1.5, 7.1.4, 7.1.3, 7.1.2, 7.1.1, 7.1.0, 7.0.7, 7.0.6, 7.0.5, 7.0.4, 7.0.3, 7.0.2, 7.0.1, 7.0.0, 6.6.5, 6.6.4 (global constraint requires ==6.6.3) trying: happstack-server-6.6.3 trying: transformers-base-0.4.4 (dependency of happstack-server-6.6.3) trying: transformers-compat-0.4.0.4 (dependency of transformers-base-0.4.4) trying: transformers-compat-0.4.0.4:-two trying: transformers-compat-0.4.0.4:-three next goal: transformers (dependency of happstack-server-6.6.3) rejecting: transformers-0.4.2.0/installed-21d..., 0.4.3.0, 0.4.2.0, 0.4.1.0, 0.3.0.0 (conflict: happstack-server => transformers>=0.1.3 && <0.3) rejecting: transformers-0.2.2.1, 0.2.2.0, 0.2.1.0, 0.2.0.0 (conflict: transformers-compat-0.4.0.4:three => transformers>=0.4.1 && <0.5) rejecting: transformers-0.1.4.0, 0.1.3.0 (conflict: transformers-base => transformers>=0.2) rejecting: transformers-0.1.1.0, 0.1.0.1, 0.1.0.0, 0.0.1.0, 0.0.0.0, 0.4.0.0 (conflict: happstack-server => transformers>=0.1.3 && <0.3) Dependency tree exhaustively searched.