Resolving dependencies...
cabal: Could not resolve dependencies:
trying: happstack-authenticate-2.2.0 (user goal)
trying: base-4.7.0.1/installed-e4b... (dependency of
happstack-authenticate-2.2.0)
next goal: userid (dependency of happstack-authenticate-2.2.0)
rejecting: userid-0.1.1.0, 0.1.0.0 (conflict: base==4.7.0.1/installed-e4b...,
userid => base>=4.8 && <4.9)
Dependency tree exhaustively searched.