Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gtk3-mac-integration (user goal)
rejecting: gtk3-mac-integration-0.3.4.0 (conflict: requires pkg-config package
gtk-mac-integration-gtk3>=2.0.0, not found in the pkg-config database)
rejecting: gtk3-mac-integration-0.3.3.1, gtk3-mac-integration-0.3.3.0,
gtk3-mac-integration-0.3.2.1, gtk3-mac-integration-0.3.2.0,
gtk3-mac-integration-0.3.1.1, gtk3-mac-integration-0.3.1.0,
gtk3-mac-integration-0.3.0.3, gtk3-mac-integration-0.3.0.2,
gtk3-mac-integration-0.3.0.1, gtk3-mac-integration-0.3.0.0,
gtk3-mac-integration-0.2.0.4 (constraint from user target requires ==0.3.4.0)
Dependency tree exhaustively searched.