Resolving dependencies... cabal: Could not resolve dependencies: next goal: species (user goal) rejecting: species-0.4, species-0.3.4.2, species-0.3.4.1, species-0.3.4, species-0.3.3, species-0.3.2.4, species-0.3.2.3, species-0.3.2.1, species-0.3.2, species-0.3.1, species-0.3.0.2, species-0.3.0.1 (constraint from user target requires ==0.3) trying: species-0.3 trying: base-4.9.0.0/installed-4.9... (dependency of species-0.3) next goal: template-haskell (dependency of species-0.3) rejecting: template-haskell-2.11.0.0/installed-2.1..., template-haskell-2.11.0.0, template-haskell-2.10.0.0, template-haskell-2.9.0.0, template-haskell-2.8.0.0, template-haskell-2.7.0.0, template-haskell-2.6.0.0, template-haskell-2.5.0.0 (conflict: species => template-haskell>=2.4 && <2.5) rejecting: template-haskell-2.4.0.1 (conflict: base==4.9.0.0/installed-4.9..., template-haskell => base==4.2.*) rejecting: template-haskell-2.4.0.0 (conflict: base==4.9.0.0/installed-4.9..., template-haskell => base>=3 && <4.3) rejecting: template-haskell-2.3.0.1, template-haskell-2.3.0.0, template-haskell-2.2.0.0 (conflict: species => template-haskell>=2.4 && <2.5) Dependency tree exhaustively searched.