Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: gi-gtksheet (user goal)
[__0] rejecting: gi-gtksheet-4.0.1 (conflict: pkg-config package
gtksheet-4.0-any, not found in the pkg-config database)
[__0] fail (backjumping, conflict set: gi-gtksheet)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gtksheet