diff --git a/chapter08/tcl.xml b/chapter08/tcl.xml
index 4e03f8625..41e4b80aa 100644
--- a/chapter08/tcl.xml
+++ b/chapter08/tcl.xml
@@ -63,24 +63,7 @@
 <screen><userinput remap="configure">SRCDIR=$(pwd)
 cd unix
 ./configure --prefix=/usr           \
-            --mandir=/usr/share/man \
-            $([ "$(uname -m)" = x86_64 ] &amp;&amp; echo --enable-64bit)</userinput></screen>
-
-    <variablelist>
-      <title>The meaning of the configure options:</title>
-
-      <varlistentry>
-        <term><parameter>$([ "$(uname -m)" = x86_64 ] &amp;&amp; echo --enable-64bit)</parameter></term>
-        <listitem>
-          <para>The construct <parameter>$(&lt;shell command&gt;)</parameter>
-          is replaced by the output of the shell command.  Here this output is
-          empty if running on a 32 bit machine, and is
-          <parameter>--enable-64bit</parameter> if running on a 64 bit machine.
-          </para>
-        </listitem>
-      </varlistentry>
-
-    </variablelist>
+            --mandir=/usr/share/man</userinput></screen>
 
     <para>Build the package:</para>