Resolving dependencies... cabal: Could not resolve dependencies: next goal: lio (user goal) rejecting: lio-0.11.5.0, 0.11.4.2, 0.11.4.1, 0.11.4.0, 0.11.3.0, 0.11.2.0, 0.11.0.1, 0.11.0.0, 0.10.0.0, 0.9.2.2, 0.9.2.0, 0.9.1.2, 0.9.1.1, 0.9.1.0, 0.9.0.1, 0.9.0.0, 0.1.3, 0.1.2, 0.1.1 (global constraint requires ==0.1.0) trying: lio-0.1.0 trying: base-4.8.1.0/installed-4f7... (dependency of lio-0.1.0) next goal: cereal (dependency of lio-0.1.0) rejecting: cereal-0.5.1.0, 0.5.0.0, 0.4.1.1, 0.4.1.0, 0.4.0.1, 0.4.0.0 (conflict: lio => cereal>=0.3.3 && <0.4) trying: cereal-0.3.5.2 rejecting: cereal-0.3.5.2:+split-base (conflict: base==4.8.1.0/installed-4f7..., cereal-0.3.5.2:split-base => base>=4 && <4.7) rejecting: cereal-0.3.5.2:-split-base (conflict: base==4.8.1.0/installed-4f7..., cereal-0.3.5.2:split-base => base<3.0) Dependency tree exhaustively searched.