I think that I figured out how to compile and install.
Now to get it to show up on reboot...
Am I correct in my analysis of what I've read that I can put the directory where the new stuff is installed into .filetool.lst and backup and it will show up upon reboot from then on?
Of course this is assuming I can figure out where it all went?
I suppose that the proper way to do this is create an extensions for librsync and rdiff-backup. Creating an extension seems a bit daunting and I'm not sure exactly what is required. I'll read some more in the wiki and the forum.