Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: gi-ayatana-appindicator3 (user goal)
[__0] rejecting: gi-ayatana-appindicator3-0.1.0 (conflict: pkg-config package
ayatana-appindicator3-0.1-any, not found in the pkg-config database)
[__0] fail (backjumping, conflict set: gi-ayatana-appindicator3)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-ayatana-appindicator3