Tweak note for libgmp.so issue

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10495 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

prologue/hostreqs.xml

@@ -68,10 +68,11 @@
       <note><para>On some distributions, there have been reports that some
       libraries used by gcc have can be in an inconsistent state and that this
       interferes with building some LFS packages.  To check this, look in
-      /usr/lib for libgmp.la, libmpfr.la, and libmpc.la.  Either all three
-      should be present or absent, but not only one or two.  If the problem
-      exists on your system, either rename or delete the .la files or install
-      the appropriate missing package.</para></note>
+      /usr/lib and possibly /usr/lib64 for libgmp.la, libmpfr.la, and
+      libmpc.la.  Either all three should be present or absent, but not only
+      one or two.  If the problem exists on your system, either rename or
+      delete the .la files or install the appropriate missing
+      package.</para></note>
 
     </listitem>