This is a known problem with glibc-2.3.2.
There are three things you can do:
1) Use Glibc-2.3.1
2) Use the LFS-CVS book which has correct instructions for building Glibc-2.3.2. The catch is that you need to restart chapter 5 from the beginning.
3) Read the FAQ at http://linuxfromscratch.org/faq/#why-not-version
which has instructions how to build Glibc-2.3.2 using the LFS-4.1 book.