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diff --git a/include/mach/boolean.h b/include/mach/boolean.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File:	mach/boolean.h
+ *
+ *	Boolean data type.
+ *
+ */
+
+#ifndef	_MACH_BOOLEAN_H_
+#define	_MACH_BOOLEAN_H_
+
+/*
+ *	Pick up "boolean_t" type definition
+ */
+
+#ifndef	ASSEMBLER
+#include <mach/machine/boolean.h>
+#endif	/* ASSEMBLER */
+
+#endif	/* _MACH_BOOLEAN_H_ */
+
+/*
+ *	Define TRUE and FALSE, only if they haven't been before,
+ *	and not if they're explicitly refused.  Note that we're
+ *	outside the BOOLEAN_H_ conditional, to avoid ordering
+ *	problems.
+ */
+
+#if	!defined(NOBOOL)
+
+#ifndef	TRUE
+#define TRUE	((boolean_t) 1)
+#endif	/* TRUE */
+
+#ifndef	FALSE
+#define FALSE	((boolean_t) 0)
+#endif	/* FALSE */
+
+#endif	/* !defined(NOBOOL) */