As far as I can see, ipv6/ipv4 compatibility is configured at compile-time and it’s mutually exclusive. Therefore other distros created packages for each option: http://www.rpmfind.net/linux/rpm2html/search.php?query=opentracker-ipv4 Obviously for the time being it would be advisable to do the same, unless someone wants to introduce the necessary C changes/configuration to detect ipv4/ipv6 on runtime.