added gawk patch explanation

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@1948 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/gawk-exp.xml

@@ -0,0 +1,11 @@
+<sect2>
+<title>Command explanations</title>
+
+<para><userinput>patch -Np1 -i ../gawk-&gawk-version;.patch:</userinput> This
+patch alters the code that determines the location of the
+<filename class="directory">libexec</filename> directory. This patch will
+allow us to override it by passing <emphasis>--libexecdir</emphasis> to the
+configure script.</para>
+
+</sect2>
+