Index: README
===================================================================
--- README	(revision 1781785)
+++ README	(working copy)
@@ -106,7 +106,15 @@
 Remember when updating from svn that you must rerun ./buildconf again 
 to effect any changes made to the build schema in your fresh update.
 
+Subtle differences between tarball and Subversion:
 
+  1) The tarball version includes the libxml2 (libexpat) development
+     libraries. The subversion checkout does not. It may be required
+     to download the libxml2-dev package (Debian) using your OS
+     package tool. This may also require the following switch during
+     the configure operation: --with-libxml2=/usr.
+
+
 Configuring and Building APR on Unix
 ====================================