Resolving dependencies... cabal: Could not resolve dependencies: trying: obd-0.2.1.1 (user goal) trying: base-4.9.0.0/installed-4.9... (dependency of obd-0.2.1.1) next goal: transformers (dependency of obd-0.2.1.1) rejecting: transformers-0.5.2.0/installed-0.5..., transformers-0.5.2.0, transformers-0.5.1.0, transformers-0.5.0.1, transformers-0.5.0.0 (conflict: obd => transformers>=0.4.2.0 && <0.5) rejecting: transformers-0.4.3.0, transformers-0.4.2.0 (conflict: base==4.9.0.0/installed-4.9..., transformers => base>=2 && <4.9) rejecting: transformers-0.4.1.0, transformers-0.3.0.0, transformers-0.2.2.1, transformers-0.2.1.0, transformers-0.2.0.0, transformers-0.1.4.0, transformers-0.1.3.0, transformers-0.1.1.0, transformers-0.1.0.1, transformers-0.0.1.0, transformers-0.0.0.0, transformers-0.5.0.2, transformers-0.4.0.0, transformers-0.2.2.0, transformers-0.1.0.0 (conflict: obd => transformers>=0.4.2.0 && <0.5) Dependency tree exhaustively searched.