Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happstack-authenticate (user goal)
rejecting: happstack-authenticate-2.3.4.6, happstack-authenticate-2.3.4.5,
happstack-authenticate-2.3.4.4, happstack-authenticate-2.3.4.3,
happstack-authenticate-2.3.4.2, happstack-authenticate-2.3.4.1,
happstack-authenticate-2.3.4, happstack-authenticate-2.3.3,
happstack-authenticate-2.3.2, happstack-authenticate-2.3.1,
happstack-authenticate-2.3.0, happstack-authenticate-2.2.0,
happstack-authenticate-2.1.5, happstack-authenticate-2.1.4 (constraint from
user target requires ==2.1.3)
trying: happstack-authenticate-2.1.3
next goal: base (dependency of happstack-authenticate-2.1.3)
rejecting: base-4.9.0.0/installed-4.9... (conflict: happstack-authenticate =>
base<0)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.