While Fedora 11 contains ipv6calc-0.71.0-4.fc11.i586 (from 2007), already newer versions are existing, latest one is 0.72.2 (released today), can be found at ftp://ftp.bieringer.de/pub/linux/IPv6/ipv6calc/ Pls. release also this version to RHEL.
I've updated rawhide with 0.71.1 last week, but ok. It will be in next F-11 update.
ipv6calc-0.72.2-1.fc11 has been submitted as an update for Fedora 11. http://admin.fedoraproject.org/updates/ipv6calc-0.72.2-1.fc11
ipv6calc-0.72.2-1.fc11 has been pushed to the Fedora 11 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update ipv6calc'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F11/FEDORA-2009-6511
ipv6calc-0.72.2-1.fc11 has been pushed to the Fedora 11 stable repository. If problems still persist, please make note of it in this bug report.