Something like this seems missing.
Cheers,
Ralf
* NEWS: Update.
diff --git a/NEWS b/NEWS
index 4fca50c..1ec32f8 100644
--- a/NEWS
+++ b/NEWS
@@ -46,6 +46,13 @@ GNU Autoconf NEWS - User visible changes.
** Many cache variables used by Autoconf's macros are now documented.
+** configure scripts work better on DJGPP again; the introduction of shell
+ functions in 2.64 exposed a DJGPP bash 2.04 memory corruption bug with
+ `return' from a function, causing many test failures.
+
+** configure does not fail on embedded systems without fopen in the C
+ library, such as AVR or RTEMS. Regression introduced in 2.64.
+
* Major changes in Autoconf 2.64 (2009-07-26) [stable]
Released by Eric Blake, based on git versions 2.63b.*.
