Use the LiveCD
My recommendation is to use the LiveCD, even if you have another distro already installed.
The LiveCD guarentees an uncontaminated build, avoiding any issues introduced by the host system, and has all the required files included - no more hunting for the version as stated in the book.
It includes X running XFCE, IRC clients, Firefox and a copy of the book, which should be everything you need to get LFS compiled and installed without trouble.
I recommend the LiveCD for your 'first' LFS, and use your own discretion afterwards if you build again, as you'll know how things are 'supposed' to go.