1 files changed, 32 insertions, 3 deletions
diff --git a/chapter06/m4.xml b/chapter06/m4.xml
index f81e5c583..ba350ab94 100644
--- a/chapter06/m4.xml
+++ b/chapter06/m4.xml
@@ -3,13 +3,14 @@
   <!ENTITY % general-entities SYSTEM "../general.ent">
   %general-entities;
 ]>
-<sect1 id="ch-system-m4" xreflabel="M4" role="wrap">
+<sect1 id="ch-system-m4" role="wrap">
 <title>M4-&m4-version;</title>
 <?dbhtml filename="m4.html"?>
 
 <indexterm zone="ch-system-m4"><primary sortas="a-M4">M4</primary></indexterm>
 
 <sect2 role="package"><title/>
+<para>The M4 package contains a macro processor.</para>
 
 <segmentedlist>
 <segtitle>&buildtime;</segtitle>
@@ -17,6 +18,11 @@
 <seglistitem><seg>0.1 SBU</seg><seg>3.0 MB</seg></seglistitem>
 </segmentedlist>
 
+<segmentedlist>
+<segtitle>M4 installation depends on</segtitle>
+<seglistitem><seg>Bash, Binutils, Coreutils, Diffutils, GCC,
+Gettext, Glibc, Grep, Make, Perl, and Sed</seg></seglistitem>
+</segmentedlist>
 </sect2>
 
 <sect2 role="installation">
@@ -33,7 +39,7 @@
 <para>To test the results, issue:
 <userinput>make check</userinput>.</para>
 
-<para>And install the package:</para>
+<para>Install the package:</para>
 
 <screen><userinput>make install</userinput></screen>
 
@@ -42,8 +48,31 @@
 
 <sect2 id="contents-m4" role="content"><title>Contents of M4</title>
 
-<para>See testing</para>
+<segmentedlist>
+<segtitle>Installed program</segtitle>
+<seglistitem><seg>m4</seg></seglistitem>
+</segmentedlist>
+
+<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
+<?dbfo list-presentation="list"?>
+
+<varlistentry id="m4">
+<term><command>m4</command></term>
+<listitem>
+<para>copies the given files while expanding the macros that they
+contain. These macros are either built-in or user-defined and can take
+any number of arguments. Besides performing macro expansion,
+<command>m4</command> has
+built-in functions for including named files, running Unix commands,
+performing integer arithmetic, manipulating text, recursion, etc. The
+<command>m4</command> program can be used either as a front-end to a compiler or as a
+macro processor in its own right.</para>
+<indexterm zone="ch-system-m4 m4"><primary sortas="b-m4">m4</primary></indexterm>
+</listitem>
+</varlistentry>
+</variablelist>
 
 </sect2>
 
 </sect1>
+