Resolving dependencies... Error: cabal: Could not resolve dependencies: [__0] trying: hslua-list-1.0.0 (user goal) [__1] next goal: hslua-core (dependency of hslua-list) [__1] rejecting: hslua-core-2.2.1 (conflict: hslua-list => hslua-core>=2.3 && <2.4) [__1] skipping: hslua-core-2.2.0, hslua-core-2.1.0, hslua-core-2.0.0.2, hslua-core-2.0.0.1, hslua-core-2.0.0, hslua-core-1.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=2.3 && <2.4' from 'hslua-list') [__1] fail (backjumping, conflict set: hslua-core, hslua-list) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: hslua-list, hslua-core