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diff --git a/include/iprt/stdarg.h b/include/iprt/stdarg.h
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+/** @file
+ * IPRT - stdarg.h wrapper.
+ */
+
+/*
+ * Copyright (C) 2006-2012 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef ___iprt_stdarg_h
+#define ___iprt_stdarg_h
+
+#ifdef IPRT_NO_CRT
+# include <iprt/types.h>
+# include <iprt/nocrt/compiler/compiler.h>
+#else
+# include <iprt/cdefs.h>
+# if defined(RT_OS_FREEBSD) && defined(_KERNEL)
+# include <machine/stdarg.h>
+# elif defined(RT_OS_SOLARIS) && defined(_KERNEL) && defined(__GNUC__)
+# include <stdarg.h>
+# if __GNUC__ >= 4 /* System headers refers to __builtin_stdarg_start. */
+# define __builtin_stdarg_start __builtin_va_start
+# endif
+# else
+# include <stdarg.h>
+# endif
+#endif
+
+/*
+ * MSC doesn't implement va_copy.
+ */
+#ifndef va_copy
+# define va_copy(dst, src) do { (dst) = (src); } while (0) /** @todo check AMD64 */
+#endif
+
+#endif
+