Resolving dependencies... cabal: Could not resolve dependencies: trying: QuickCheck-2.9.2 (dependency of Crypto-4.2.5.1) next goal: happstack-data (dependency of happstack-helpers-0.30) rejecting: happstack-data-6.0.1, happstack-data-6.0.0, happstack-data-0.5.0.3, happstack-data-0.5.0.2, happstack-data-0.5.0, happstack-data-0.4.1 (conflict: happstack-helpers => happstack-data>=0.3 && <0.4) trying: happstack-data-0.3.3 next goal: happstack-util (dependency of happstack-data-0.3.3) rejecting: happstack-util-6.0.3, happstack-util-6.0.2, happstack-util-6.0.0, happstack-util-0.5.0.3, happstack-util-0.5.0.2, happstack-util-0.5.0.1, happstack-util-0.5.0, happstack-util-0.4.1 (conflict: happstack-data => happstack-util>=0.3.2 && <0.4) rejecting: happstack-util-0.3.2 (conflict: QuickCheck==2.9.2, happstack-util => QuickCheck<2) rejecting: happstack-util-0.3.1, happstack-util-0.2.1, happstack-util-0.1 (conflict: happstack-data => happstack-util>=0.3.2 && <0.4) Dependency tree exhaustively searched.