LFS isn't really LFS. It's RPM-based. Ewwy. Hate hate hate.
Umm... please explain. According to
this, the BLFS book gives some advice on
how to install a package management system, but to quote directly, "Dealing with package management takes the focus away from the goals of these books—teaching how a Linux system is built."
I started compiling LFS, but didn't know how to do certain things and got frustrated when the toolchain (namely, GCC) wouldn't install properly. I think I know what the problem was (I should have created a new make.conf, I think), but I do remember there being nothing RPM-ish about it. It really was a matter or ./configure && make && make install.
Some LFS-based distros -- for example, dyne:bolic or Yoper --
can use .rpm files and have package management utilities, but that's not really an aspect of LFS, but of the individual distros.