Brian,
I checked some of my notes, the following packages are needed on Ubuntu 12.04.1 LTS to run RIP44d:
included on a base installation: - perl - perl-base - perl-modules
must be added: - libio-socket-multicast-perl - libio-interface-perl
'sudo apt-get install libio-socket-multicast-perl libio-interface-perl'
I will make a Wiki entry shortly after Chris creates an account (I've already dropped him an email).
~Lynwood KB3VWG