It seems that to embed the files, one could copy them to the mail-notification source, install them to, say, /usr/share/mail-notification and add that to the icon search path via gtk_icon_theme_append_search_path() (Docs at http://library.gnome.org/devel/gtk/2.18/GtkIconTheme.html)
It seems that to embed the files, one could copy them to the mail-notification source, install them to, say, /usr/share/ mail-notificati on and add that to the icon search path via gtk_icon_ theme_append_ search_ path() (Docs at http:// library. gnome.org/ devel/gtk/ 2.18/GtkIconThe me.html)