Adding reminder to unpack Linuxthreads.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2717 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/glibc-inst.xml

@@ -9,7 +9,12 @@ pointing at <filename>/stage1</filename>. We cannot adjust the specs and
 ldscripts before the Glibc install, because the Glibc autoconf tests would then
 give bogus results and thus defeat our goal of achieving a clean build.</para>
 
-<para>Apply the same patch as we used previously:</para>
+<para>Before starting to build Glibc, remember to unpack the Glibc-linuxthreads
+again inside the <filename>glibc-&glibc-version;</filename> directory, and to
+unset any environment variables that override the default optimization
+flags.</para>
+
+<para>Then apply the same patch we used previously:</para>
                                                                                 
 <para><screen><userinput>patch -Np1 -i ../glibc-2.3.2-sscanf-1.patch
 </userinput></screen></para>