Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: camfort (user goal)
rejecting: camfort-0.901, camfort-0.900, camfort-0.804, camfort-0.802
(constraint from user target requires ==0.800)
trying: camfort-0.800
next goal: base (dependency of camfort-0.800)
rejecting: base-4.9.0.0/installed-4.9... (conflict: base =>
ghc-prim==0.5.0.0/installed-0.5..., camfort => ghc-prim==0.4.0.0)
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.