A mail from Armin K. of the LFS team asked in the mailing list about people using Slackware and any problems building with Slackware.
His post stems from using an incomplete, partial, or irregular install of Slackware rather than the full complete system.
If you use Slackware, please use a full and complete installation to avoid problems.
Thank you.
Source:
http://article.gmane.org/gmane.linux.lfs.devel/15604