diff --git a/ChangeLog b/ChangeLog
index 3ae0ca15ed5..7e8d68f780b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-08-10  Glenn Morris  <rgm@gnu.org>
+
+	* configure.in (cpp_undefs): Rename from `undefs', update uses.
+	Use $srcdir rather than $top_srcdir.  Set before calling AC_OUTPUT,
+	and explicitly export there.  (Bug#507.)  (Sync of trunk 2008-07-01).
+
 2008-08-05  Ulrich Mueller  <ulm@gentoo.org>
 
 	* configure.in: Add checks for krb5_error.text and