Resolving dependencies... cabal: Could not resolve dependencies: next goal: VKHS (user goal) rejecting: VKHS-0.5.7, 0.5.6, 0.5.5, 0.5.4, 0.5.3, 0.5.2, 0.5.1, 0.5.0, 0.3.3, 0.3.2, 0.3.1, 0.3.0, 0.2.0, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1.2, 0.1.1 (global constraint requires ==0.1.0) trying: VKHS-0.1.0 trying: base-4.8.1.0/installed-4f7... (dependency of VKHS-0.1.0) next goal: template-haskell (dependency of VKHS-0.1.0) rejecting: template-haskell-2.10.0.0/installed-90e..., 2.10.0.0, 2.9.0.0, 2.8.0.0 (conflict: VKHS => template-haskell==2.7.*) rejecting: template-haskell-2.7.0.0 (conflict: base==4.8.1.0/installed-4f7..., template-haskell => base==4.5.*) rejecting: template-haskell-2.6.0.0, 2.5.0.0, 2.4.0.1, 2.4.0.0, 2.3.0.1, 2.3.0.0, 2.2.0.0 (conflict: VKHS => template-haskell==2.7.*) Dependency tree exhaustively searched.