Ludovic Courtès <ludo@gnu.org> writes:
>
> Only Ardour and gtkmm depend on it; are they find after this change?

I've tested ardour, it builds and runs successfully.

Ardour depends on gtkmm-2 (propagates pangomm-2.46) but also add pangomm
to the inputs. I don't know we need pangomm or not.

I also make some minor changes in these patches, Update gtkmm to 4.6.1
and remove atkmm from its propagated-inputs. GTK4 no longer use ATK.