Raspberry Pi port, piCore-15.0 is available!
$ barrier*** WARNING *** The program 'barrier' called 'DNSServiceRegister()' which is not supported (or only supported partially) in the Apple Bonjour compatibility layer of Avahi.*** WARNING *** Please fix your application to use the native API of Avahi!*** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=barrier&f=DNSServiceRegister>