Index: chapter04/aboutsbus.xml
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--- chapter04/aboutsbus.xml	(revision 663ecfcc5f04e7c2860b83ef89e49f5e8b68bbbe)
+++ chapter04/aboutsbus.xml	(revision 8fee5c5cb97a9c0e7253420af032aad0cd541204)
@@ -1,41 +1,44 @@
 <?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
   <!ENTITY % general-entities SYSTEM "../general.ent">
   %general-entities;
 ]>
+
 <sect1 id="prepare-aboutsbus">
-<title>About SBUs</title>
-<?dbhtml filename="aboutsbus.html"?>
+  <?dbhtml filename="aboutsbus.html"?>
 
-<para>Many people would like to know beforehand approximately how long
-it takes to compile and install each package. Because Linux From
-Scratch can be built on many different systems, it is impossible to
-provide accurate time estimates.  The biggest package (Glibc) will
-take approximately 20 minutes on the fastest systems, but could take
-up to three days on slower systems! Instead of providing actual times,
-the Standard Build Unit (SBU) measure will be
-used instead.</para>
+  <title>About SBUs</title>
 
-<para>The SBU measure works as follows. The first package to be compiled
-from this book is Binutils in <xref linkend="chapter-temporary-tools"/>.  The
-time it takes to compile this package is what will be referred to as the
-Standard Build Unit or SBU. All other compile times will be expressed relative
-to this time.</para>
+  <para>Many people would like to know beforehand approximately how long
+  it takes to compile and install each package. Because Linux From
+  Scratch can be built on many different systems, it is impossible to
+  provide accurate time estimates. The biggest package (Glibc) will
+  take approximately 20 minutes on the fastest systems, but could take
+  up to three days on slower systems! Instead of providing actual times,
+  the Standard Build Unit (SBU) measure will be
+  used instead.</para>
 
-<para>For example, consider a package whose compilation time is 4.5
-SBUs. This means that if a system took 10 minutes to compile and
-install the first pass of Binutils, it will take
-<emphasis>approximately</emphasis> 45 minutes to build this example package.
-Fortunately, most build times are shorter than the one for Binutils.</para>
+  <para>The SBU measure works as follows. The first package to be compiled
+  from this book is Binutils in <xref linkend="chapter-temporary-tools"/>. The
+  time it takes to compile this package is what will be referred to as the
+  Standard Build Unit or SBU. All other compile times will be expressed relative
+  to this time.</para>
 
-<para>In general, SBUs are not entirely accurate because they depend on many
-factors, including the host system's version of GCC. Note that on Symmetric
-Multi-Processor (SMP)-based machines, SBUs are even less accurate.  They are
-provided here to give an estimate of how long it might take to install a
-package, but the numbers can vary by as much as dozens of minutes in some
-cases.</para>
+  <para>For example, consider a package whose compilation time is 4.5
+  SBUs. This means that if a system took 10 minutes to compile and
+  install the first pass of Binutils, it will take
+  <emphasis>approximately</emphasis> 45 minutes to build this example package.
+  Fortunately, most build times are shorter than the one for Binutils.</para>
 
-<para>To view actual timings for a number of specific machines, we recommend
-The LinuxFromScratch SBU Home Page at <ulink url="&lfs-root;~bdubbs/"/>.</para>
+  <para>In general, SBUs are not entirely accurate because they depend on many
+  factors, including the host system's version of GCC. Note that on Symmetric
+  Multi-Processor (SMP)-based machines, SBUs are even less accurate. They are
+  provided here to give an estimate of how long it might take to install a
+  package, but the numbers can vary by as much as dozens of minutes in some
+  cases.</para>
+
+  <para>To view actual timings for a number of specific machines, we recommend
+  The LinuxFromScratch SBU Home Page at <ulink url="&lfs-root;~bdubbs/"/>.</para>
 
 </sect1>
