Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: halberd (user goal)
rejecting: halberd-0.1.2.9, 0.1.2.8, 0.1.2.7, 0.1.2.6, 0.1.2.5, 0.1.2.4,
0.1.2.3, 0.1.2.2, 0.1.2.1, 0.1.2, 0.1.1 (global constraint requires ==0.1)
trying: halberd-0.1
next goal: base (dependency of halberd-0.1)
rejecting: base-4.7.0.1/installed-e4b... (conflict: halberd => base>=4.5 &&
<4.7)
rejecting: base-4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0,
4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0,
4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires installed
instance)
Dependency tree exhaustively searched.