Hi
You say you are using slackware which is not a problem if made compliant.
Can you post the output of version-check from this page,
http://www.linuxfromscratch.org/lfs/.../hostreqs.html
This will make sure your host system is upto building lfs,
When this is established then you can move on.
FYI this is the 1st part of building lfs.