More info is needed, such as your host system.
Migh I suggets using the official LFS support medium like the lfs-support mailinglist, especially if you're working with CVS. Make sure you read the mailinglist archives, a lot of problems that come with CVS have been documented. You can save yourself a lot of time by reading the mailinglists and using the search engine.
Links to all these can be found on the
http://www.linuxfromscratch.org website.