diff --git a/ChangeLog b/ChangeLog
index 68df3d64a..7bb22fb3e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-12-03  David Ayers  <ayers@fsfe.org>
+
+	* Source/NSDecimalNumber.m: (isinf,isnan,isinff,isnanf):
+	Temporary empty definitions of C99 macros for environments
+	which do not define them.
+	
 2007-12-03  Fred Kiefer <FredKiefer@gmx.de>
 
 	* Source/NSIndexSet.m (-initWithCoder:,	-encodeWithCoder)
diff --git a/Source/NSDecimalNumber.m b/Source/NSDecimalNumber.m
index 8a32c88b7..4b169a71c 100644
--- a/Source/NSDecimalNumber.m
+++ b/Source/NSDecimalNumber.m
@@ -37,6 +37,21 @@
 
 #include "GSPrivate.h"
 
+// AYERS: Temporary workaround until correct flags/includes for other
+// libc implemenatations can be identified.
+#ifndef isinf
+#define isinf(n) ( 0 )
+#endif
+#ifndef isnan
+#define isnan(n) ( 0 )
+#endif 
+#ifndef isinff
+#define isinff(n) ( 0 )
+#endif
+#ifndef isnanf
+#define isnanf(n) ( 0 )
+#endif 
+
 // shared default behavior for NSDecimalNumber class
 static NSDecimalNumberHandler *handler;