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Index: a/src/gcc/config/gnu.h
===================================================================
--- a/src/gcc/config/gnu.h	(révision 195825)
+++ b/src/gcc/config/gnu.h	(révision 195826)
@@ -33,7 +33,7 @@
 	builtin_define ("__gnu_hurd__");	\
 	builtin_define ("__GNU__");		\
 	builtin_define_std ("unix");		\
-	builtin_define_std ("MACH");		\
+	builtin_define ("__MACH__");		\
 	builtin_assert ("system=gnu");		\
 	builtin_assert ("system=mach");		\
 	builtin_assert ("system=unix");		\