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Unfortunately latest libgcc started to utlize these.

  - Rene Rebe <rene@exactcode.de>

--- /dev/null	2010-11-17 09:26:17.638732721 +0000
+++ dietlibc-0.32/include/fenv.h	2011-01-06 14:53:10.774797870 +0000
@@ -0,0 +1,14 @@
+/* stubs, for gcc */
+#define FE_INEXACT	0x20
+#define FE_UNDERFLOW	0x10
+#define FE_OVERFLOW	0x08
+#define FE_DIVBYZERO	0x04
+#define FE_INVALID	0x01
+
+#define FE_ALL_EXCEPT \
+	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+#define FE_TONEAREST	0
+#define FE_DOWNWARD	0x400
+#define FE_UPWARD	0x800
+#define FE_TOWARDZERO	0xc00