I find at least 1 package which use GTK3 and linked to this : libpolkit-gtk-1-0. policykit-1-gnome needs to provide a package of the library build against GTK2 if we want to fix it.
I find at least 1 package which use GTK3 and linked to this : libpolkit-gtk-1-0. policykit-1-gnome needs to provide a package of the library build against GTK2 if we want to fix it.