Resolving dependencies... cabal: Could not resolve dependencies: next goal: hurdle (user goal) rejecting: hurdle-0.4.0, 0.3.0 (global constraint requires ==0.2.0) trying: hurdle-0.2.0 trying: pretty-1.1.2.0/installed-293... (dependency of hurdle-0.2.0) next goal: deepseq (dependency of pretty-1.1.2.0/installed-293...) rejecting: deepseq-1.4.1.1/installed-8fb... (conflict: deepseq => array==0.5.1.0/installed-d42..., hurdle => array>=0.2.0.0 && <0.4) rejecting: deepseq-1.4.1.2, 1.4.1.1, 1.4.1.0, 1.4.0.0, 1.3.0.2, 1.3.0.1, 1.3.0.0, 1.2.0.1, 1.2.0.0, 1.1.0.2, 1.1.0.1, 1.1.0.0, 1.0.0.0 (conflict: pretty => deepseq==1.4.1.1/installed-8fb...) Dependency tree exhaustively searched.