Resolving dependencies... cabal: Could not resolve dependencies: trying: hurdle-0.4.0 (user goal) trying: bytestring-0.10.6.0/installed-236... (dependency of hurdle-0.4.0) next goal: deepseq (dependency of bytestring-0.10.6.0/installed-236...) 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: bytestring => deepseq==1.4.1.1/installed-8fb...) Dependency tree exhaustively searched.