libavahi-ui-gtk3-dev - 0.8-5+deb11u3 main

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 GTK+ library of Avahi.