libdbusmenu-gtk3-dev 12.10.3+14.10.20140610-0ubuntu1 (amd64 binary) in ubuntu-rtm 14.09

 libdbusmenu passes a menu structure across DBus so that a program can
 create a menu simply without worrying about how it is displayed on the
 other side of the bus.
 .
 This package contains files that are needed to build GTK+ applications.