Description of problem: The links to virt-install and oz-install are broken on the web man page... http://libguestfs.org/virt-builder.1.html
I've pushed this: https://github.com/libguestfs/libguestfs/commit/edacd479faf7175eb2ddb10dd8c7ab4c90db5d0b Unfortunately this is not exactly a fix for either problem as man.he.net simply does not have man pages for oz-install or virt-install, although they are usually quite comprehensive. (Note that this won't be reflected on the website until the next development release happens)