Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: Spock-api-ghcjs-0.12.0.1 (user goal)
[__1] unknown package: ghcjs-base (dependency of Spock-api-ghcjs)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: Spock-api-ghcjs, ghcjs-base