Resolving dependencies...
cabal: Could not resolve dependencies:
trying: happstack-authenticate-2.1.5 (user goal)
trying: base-4.7.0.1/installed-e4b... (dependency of
happstack-authenticate-2.1.5)
next goal: userid (dependency of happstack-authenticate-2.1.5)
rejecting: userid-0.1.0.0 (conflict: base==4.7.0.1/installed-e4b..., userid =>
base>=4.8 && <4.9)
Dependency tree exhaustively searched.