Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: poppler (user goal)
rejecting: poppler-0.13, 0.12.3, 0.12.2.2, 0.12.2.1, 0.12.2, 0.12.1 (global
constraint requires ==0.12.0)
trying: poppler-0.12.0
next goal: tk (dependency of poppler-0.12.0)
Dependency tree exhaustively searched.