> Code in src/gtkutil.c calls gtk_window_parse_geometry, which is
> deprecated
> (https://developer.gnome.org/gtk3/stable/GtkWindow.html#gtk-window-parse-geometry)
> and has been removed in unstable
> (https://git.gnome.org/browse/gtk+/diff/gtk/gtkwindow.h?id=c2125e80a345af13d5d886d4ae56fba2926dc267).
> Emacs needs to stop using this function.
By default we don't call gtk_window_parse_geometry any more so this
should not be grave.
Can you build with unstable?