Resolving dependencies...
cabal: Could not resolve dependencies:
trying: ivory-backend-c-0.1.0.3 (user goal)
trying: base-4.8.2.0/installed-0d6... (dependency of ivory-backend-c-0.1.0.3)
next goal: ivory-opts (dependency of ivory-backend-c-0.1.0.3)
rejecting: ivory-opts-0.1.0.1, 0.1.0.0 (conflict:
base==4.8.2.0/installed-0d6..., ivory-opts => base>=4.6 && <4.7)
Dependency tree exhaustively searched.