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 (global constraint requires ==0.1.2)
rejecting: halberd-0.1.2 (conflict: halberd => halberd==0.1.1)
rejecting: halberd-0.1.1, 0.1 (global constraint requires ==0.1.2)
Dependency tree exhaustively searched.