Resolving dependencies... cabal: Could not resolve dependencies: next goal: epic (user goal) rejecting: epic-0.9.3.3, epic-0.9.3.2, epic-0.9.3, epic-0.9.2, epic-0.9 (constraint from user target requires ==0.1.13) trying: epic-0.1.13 trying: base-4.9.0.0/installed-4.9... (dependency of epic-0.1.13) next goal: haskell98 (dependency of epic-0.1.13) rejecting: haskell98-2.0.0.3, haskell98-2.0.0.2, haskell98-2.0.0.1, haskell98-2.0.0.0 (conflict: epic => haskell98<2) rejecting: haskell98-1.1.0.1, haskell98-1.1.0.0, haskell98-1.0.1.1 (conflict: base==4.9.0.0/installed-4.9..., haskell98 => base>=3 && <4.6) rejecting: haskell98-1.0.1.0 (conflict: base==4.9.0.0/installed-4.9..., haskell98 => base<4.6) rejecting: haskell98-1.0 (conflict: base==4.9.0.0/installed-4.9..., haskell98 => base<4.3) Dependency tree exhaustively searched.