diff --git a/ChangeLog b/ChangeLog
index 99456c11e..75505eed4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,17 @@
+2007-01-23  Kevin Ryde  <user42@zip.com.au>
+
+	* configure.in (isinf, isnan): Use a volatile global to stop gcc
+	optimizing out the test.  In particular this fixes solaris where there
+	isn't an isinf or isnan (though gcc still optimizes as if there is).
+	Reported by Hugh Sasse.
+	(AC_C_VOLATILE): New.
+
 2007-01-22  Kevin Ryde  <user42@zip.com.au>
 
 	* configure.in (AC_INIT): Don't use "echo -n", it's not portable and
 	in particular fails on solaris (resulting in literal "-n"s going into
-	the output, making the resulting configure unusable).
+	the output, making the resulting configure unusable).  Reported by
+	Hugh Sasse.
 
 2006-12-27  Kevin Ryde  <user42@zip.com.au>