I have not had enough time recently for my maintainership of gtkmm, glibmm, libxml++ and libsigc++. And I’m unlikely to find time soon. Family and (income earning) work have taken priority. That’s why glibmm and gtkmm didn’t have .0 releases until a couple of weeks after the GNOME .0 release, and why there was no real attempt to follow the GNOME release schedule this time. I’ve hardly touched cairomm for years.
It’s not a lot of work but I’ve had to find a few days every few months to keep glibmm and gtkmm up to date with API additions in glib and GTK+, to keep roughly in sync with them. There has been rather a lot of new API recently. See the list of new API in gtkmm 3.6, glibmm 2.34 , gtkmm 3.4, and glibmm 2.32. Krzesimir’s ongoing attempt to use the introspection information (rather than .defs files) would help with this but not hugely because we’d still need to take care that the API is right for C++. Some initial .hg/ccg creator script would probably be most helpful.
I have no time for the more difficult bugs that turn up occasionally. Luckily Kjell Ahlstedt, José Alburquerque and others arrive regularly in bugzilla with great fixes for hard problems. I trust Kjell and José to commit directly, but they deserve some decent patch review. Unfortunately I often keep them waiting far too long.
I need to make some change. As a start, I might stop receiving bug email for glibmm and gtkmm, and stop worrying about adding new API. I guess it will take at least one missed GNOME release cycle for some other people to take over my responsibilities.