radtest and IPv6 support

Hello all, I am trying to use radtest to test my freeradius configuration over IPv6. I have configured IPv6 on my freeradius server and a client machine from which I am firing radtest. However when I issue "radtest bob hello 2001:db95::100 100 testing123" on my client I get a "radclient: socket: cannot initialize udpfromto: Function not implemented" Google returns a few people reporting this, but answers are related to changing how localhost is resolved when testing it from the freeradius server. Is there a proper solution for using radtest over IPv6 from a remote machine? Btw radtest works fine over IPv4 on my current setup. Thanks a lot, Panos