Resolving dependencies... cabal: Could not resolve dependencies: next goal: Spock (user goal) rejecting: Spock-0.7.9.0, 0.7.8.0, 0.7.7.0, 0.7.6.0, 0.7.5.2, 0.7.5.1, 0.7.5.0, 0.7.4.0, 0.7.3.0, 0.7.2.0, 0.7.1.0, 0.7.0.0, 0.6.6.1, 0.6.6.0, 0.6.5.0, 0.6.4.0, 0.6.3.0, 0.6.2.3, 0.6.2.2, 0.6.2.1, 0.6.2.0, 0.6.1.3, 0.6.1.2, 0.6.1.1, 0.6.1.0, 0.6.0.0, 0.5.1.0, 0.5.0.1, 0.5.0.0, 0.4.4.1, 0.4.4.0, 0.4.3.5, 0.4.3.4, 0.4.3.3, 0.4.3.2, 0.4.3.1, 0.4.3.0, 0.4.2.4, 0.4.2.3, 0.4.2.2, 0.4.2.1, 0.4.2.0, 0.4.1.0, 0.4.0.1, 0.4.0.0, 0.3.0.0 (global constraint requires ==0.2.0.0) trying: Spock-0.2.0.0 trying: resource-pool-0.2.3.2 (dependency of Spock-0.2.0.0) trying: transformers-base-0.4.4 (dependency of resource-pool-0.2.3.2) trying: transformers-compat-0.4.0.4 (dependency of transformers-base-0.4.4) trying: transformers-compat-0.4.0.4:-two trying: transformers-compat-0.4.0.4:-three next goal: transformers (dependency of Spock-0.2.0.0) rejecting: transformers-0.3.0.0/installed-16a... (conflict: transformers-compat-0.4.0.4:three => transformers>=0.4.1 && <0.5) rejecting: transformers-0.4.3.0, 0.4.2.0, 0.4.1.0, 0.4.0.0 (conflict: Spock => transformers==0.3.*) rejecting: transformers-0.3.0.0 (conflict: transformers-compat-0.4.0.4:three => transformers>=0.4.1 && <0.5) rejecting: transformers-0.2.2.1, 0.2.2.0, 0.2.1.0, 0.2.0.0, 0.1.4.0, 0.1.3.0, 0.1.1.0, 0.1.0.1, 0.1.0.0, 0.0.1.0, 0.0.0.0 (conflict: Spock => transformers==0.3.*) Backjump limit reached (change with --max-backjumps).