I am currently working on updating gnome-related packages, in Guix.
I updated libsigc++, glibmm, cairomm, pangomm, atkmm and gtkmm, to their latest stable releases. Now; libsigc++, glibmm, cairomm, pangomm and atkmm play well with other other’s lastest versions; except gtkmm being outlier.
 Why is gtkmm-3.24.4 is incompatible with cairomm-1.16.0, pangomm-2.48.0 and atkmm-2.36.0, as all of these are latest stable releases?
 Will there be new release of gtkmm in 3.24 series, that will be compatible with cairomm-1.16.0, pangomm-2.48.0 and atkmm-2.36.0?
Please let me know.