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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
+  <!ENTITY % general-entities SYSTEM "../general.ent">
+  %general-entities;
+]>
+<sect1 id="prepare-aboutlfs">
+<title>About $LFS</title>
+<?dbhtml filename="aboutlfs.html"?>
+
+<para>Throughout this book the environment variable LFS will be used several
+times. It is paramount that this variable is always defined. It should be set
+to the mount point you chose for your LFS partition. Check that your LFS
+variable is set up properly with:</para>
+
+<screen><userinput>echo $LFS</userinput></screen>
+
+<para>Make sure the output shows the path to your LFS partition's mount
+point, which is <filename class="directory">/mnt/lfs</filename> if you
+followed our example. If the output is wrong, you can always set the variable
+with:</para>
+
+<screen><userinput>export LFS=/mnt/lfs</userinput></screen>
+
+<para>Having this variable set means that if you are told to run a command like
+<userinput>mkdir $LFS/tools</userinput>, you can type it literally. Your shell
+will replace "$LFS" with "/mnt/lfs" (or whatever you set the variable to) when
+it processes the command line.</para>
+
+<para>Don't forget to check that <quote>$LFS</quote> is set whenever you leave and
+reenter the environment (as when doing an <quote>su</quote> to root or another user).
+</para>
+
+</sect1>