This is similar to the (now deprecated) patches I sent on 9/28 and
10/04, but without the unpopular "source" attribute in the ip address.
You can successfully build libvirt if you have the latest release of
netcf installed, but you'll need to get the netcf source, apply the
patches in the thread listed below, and build/install netcf to get
correct/proper output.
https://fedorahosted.org/pipermail/netcf-devel/2009-October/000289.html