Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: hercules-ci-cli-0.1.0 (user goal) [__1] unknown package: hercules-ci-optparse-applicative (dependency of hercules-ci-cli) [__1] fail (backjumping, conflict set: hercules-ci-cli, hercules-ci-optparse-applicative) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: hercules-ci-cli, hercules-ci-optparse-applicative