Maintainers for libgtk-4-dev are Debian GNOME Maintainers <[email protected]>.
You may want to refer to the following packages that are part of the same source: gir1.2-gtk-4.0, gtk-4-examples, gtk-4-tests, gtk-update-icon-cache, libgtk-4-1, libgtk-4-bin, libgtk-4-common, libgtk-4-doc, libgtk-4-media-gstreamer.
You might like to refer to the libgtk-4-dev package page, to the Package Tracking System, or to the source package src:gtk4's bug page.
If you find a bug not listed here, please report it.