Resolving dependencies... cabal: Could not resolve dependencies: next goal: hs-rs-notify (user goal) rejecting: hs-rs-notify-0.1.0.3 (constraint from user target requires ==0.1.0.2) trying: hs-rs-notify-0.1.0.2 trying: base-4.10.1.0/installed-4.1... (dependency of hs-rs-notify-0.1.0.2) next goal: unix (dependency of hs-rs-notify-0.1.0.2) rejecting: unix-2.7.2.2/installed-2.7..., unix-2.7.2.2 (conflict: hs-rs-notify => unix==2.7.2.1) rejecting: unix-2.7.2.1 (conflict: base==4.10.1.0/installed-4.1..., unix => base>=4.5 && <4.10) rejecting: unix-2.7.2.0, unix-2.7.1.0, unix-2.7.0.1, unix-2.7.0.0, unix-2.6.0.1, unix-2.6.0.0, unix-2.5.1.1, unix-2.5.1.0, unix-2.5.0.0, unix-2.4.2.0, unix-2.4.1.0, unix-2.4.0.2, unix-2.4.0.1, unix-2.4.0.0, unix-2.3.2.0, unix-2.3.1.0, unix-2.3.0.0, unix-2.2.0.0, unix-2.0 (conflict: hs-rs-notify => unix==2.7.2.1) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: hs-rs-notify, base, unix