Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gi-gtkosxapplication (user goal)
rejecting: gi-gtkosxapplication-2.0.9 (constraint from user target requires
==2.0.8)
rejecting: gi-gtkosxapplication-2.0.8 (conflict: requires pkg-config package
gtk-mac-integration-gtk3>=2.0 && <3, not found in the pkg-config database)
rejecting: gi-gtkosxapplication-2.0.7, gi-gtkosxapplication-2.0.6,
gi-gtkosxapplication-2.0.5, gi-gtkosxapplication-2.0.4 (constraint from user
target requires ==2.0.8)
Dependency tree exhaustively searched.