Resolving dependencies... cabal: Could not resolve dependencies: trying: base-4.9.0.0/installed-4.9... (dependency of carboncopy-0.1.2) next goal: haskell98 (dependency of carboncopy-0.1.2) rejecting: haskell98-2.0.0.3 (conflict: base==4.9.0.0/installed-4.9..., haskell98 => base>=4.7 && <4.8) rejecting: haskell98-2.0.0.2 (conflict: base==4.9.0.0/installed-4.9..., haskell98 => base==4.6.*) trying: haskell98-2.0.0.1 next goal: array (dependency of haskell98-2.0.0.1) rejecting: array-0.5.1.1/installed-0.5..., array-0.5.1.1, array-0.5.1.0, array-0.5.0.0 (conflict: haskell98 => array>=0.3 && <0.5) rejecting: array-0.4.0.1 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.7) rejecting: array-0.4.0.0 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.6) rejecting: array-0.3.0.3 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.5) rejecting: array-0.3.0.2, array-0.3.0.1 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.4) rejecting: array-0.3.0.0 (conflict: base==4.9.0.0/installed-4.9..., array => base>=3 && <4.4) rejecting: array-0.2.0.0, array-0.1.0.0 (conflict: haskell98 => array>=0.3 && <0.5) Dependency tree exhaustively searched.