The net/avahi port is a replacement for net/mDNSResponder, but doesn't
include the libdns compatibility library that some applications may be
linked against. The patch below adds a configuration option to install
libdns_sd.so and related files.
Replace net/mDNSResponder with net/avahi. Boggle as most of your KDE
applications now refuse to start.
Over to maintainer
Committed with modifications.