Resolving dependencies... cabal: Could not resolve dependencies: next goal: flow2dot (user goal) rejecting: flow2dot-0.9.0.3, flow2dot-0.9.0.2, flow2dot-0.9.0.1, flow2dot-0.9, flow2dot-0.8, flow2dot-0.7, flow2dot-0.6.1, flow2dot-0.6, flow2dot-0.5.1, flow2dot-0.5, flow2dot-0.4 (constraint from user target requires ==0.3.1) trying: flow2dot-0.3.1 trying: base-4.9.0.0/installed-4.9... (dependency of flow2dot-0.3.1) trying: deepseq-1.4.2.0/installed-1.4... (dependency of bytestring-0.10.8.1/installed-0.1...) next goal: haskell98 (dependency of flow2dot-0.3.1) 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.*) rejecting: haskell98-2.0.0.1 (conflict: deepseq => array==0.5.1.1/installed-0.5..., haskell98 => array>=0.3 && <0.5) rejecting: haskell98-2.0.0.0 (conflict: deepseq => array==0.5.1.1/installed-0.5..., haskell98 => array>=0.3 && <0.4) 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.