Resolving dependencies... Error: cabal: Could not resolve dependencies: [__0] trying: strict-0.5 (user goal) [__1] next goal: these (dependency of strict) [__1] rejecting: these-1.1.1.1 (conflict: strict => these>=1.2 && <1.3) [__1] skipping: these-1.1.1, these-1.1, these-1.0.1, these-1, these-0.8.1, these-0.8, these-0.7.6, these-0.7.5, these-0.7.4, these-0.7.3, these-0.7.2, these-0.7.1, these-0.7, these-0.6.2.1, these-0.6.2.0, these-0.6.1.0, these-0.6.0.0, these-0.4.2, these-0.4.1, these-0.4, these-0.3, these-0.2 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=1.2 && <1.3' from 'strict') [__1] fail (backjumping, conflict set: strict, these) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: strict, these