In ports collection, some of them are up-to-date and others not. This patch fixes this issue
- accessibility/atkmm → 2.28.3
- devel/libsigc++ → 2.12.1
- devel/libsigc++30 → 3.6.0
- graphics/cairomm → 1.14.5
- x11-toolkits/gtkmm30 → 3.24.8
- x11-toolkits/pangomm → 2.46.3
Note: tested with deskutils/gnote 44.2 and sysutils/gnome-system-monitor 45.0.2 without regression.