libavahi-qt3-dev 0.6.20-2ubuntu2 (amd64 binary) in ubuntu gutsy

 Avahi is a fully LGPL framework for Multicast DNS Service Discovery.
 It allows programs to publish and discover services and hosts
 running on a local network with no specific configuration. For
 example you can plug into a network and instantly find printers to
 print to, files to look at and people to talk to.
 .
 This package contains the development headers for the interface
 to integrate the Avahi libraries into a Qt3 main loop application.