If you look at the stable book at 6.67.1 there are instructions to install this file just before the one to call for the hardware update...
Code:
tar -xvf ../udev-lfs-20140408.tar.bz2
make -f udev-lfs-20140408/Makefile.lfs install
That file is not in the wget-list, or in the required packages portion of the book. In fact, I could swear it wasn't there just a couple of days ago. So, is it supposed to be there? I see it in the current SVN. Perhaps they updated the wrong book page?
Edit: No, it is in the SVN, but not on it's package list either. I don't know if it's supposed to be in there or not, or where it comes from. Additionally, if you look at the SVN they jump a whole major version on eudev too.