diff --git a/include/stdlib/sys/stdarg.h b/include/stdlib/sys/stdarg.h
new file mode 100644
index 0000000..c315dfc
--- /dev/null
+++ b/include/stdlib/sys/stdarg.h
@@ -0,0 +1,75 @@
+/*-
+ * Copyright (c) 2002 David E. O'Brien.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_STDARG_H_
+#define	_MACHINE_STDARG_H_
+
+#include <sys/cdefs.h>
+#include <sys/_types.h>
+
+#ifndef _VA_LIST_DECLARED
+#define	_VA_LIST_DECLARED
+typedef	__va_list	va_list;
+#endif
+
+#ifdef __GNUCLIKE_BUILTIN_STDARG
+
+#define	va_start(ap, last) \
+	__builtin_va_start((ap), (last))
+
+#define	va_arg(ap, type) \
+	__builtin_va_arg((ap), type)
+
+#define	__va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
+#if __ISO_C_VISIBLE >= 1999
+#define	va_copy(dest, src) \
+	__va_copy(dest, src)
+#endif
+
+#define	va_end(ap) \
+	__builtin_va_end(ap)
+
+#elif defined(lint)
+/* Provide a fake implementation for lint's benefit */
+#define	__va_size(type) \
+	(((sizeof(type) + sizeof(long) - 1) / sizeof(long)) * sizeof(long))
+#define	va_start(ap, last) \
+	((ap) = (va_list)&(last) + __va_size(last))
+#define	va_arg(ap, type) \
+	(*(type *)((ap) += __va_size(type), (ap) - __va_size(type)))
+#define	va_end(ap)
+
+#else
+#error this file needs to be ported to your compiler
+#endif
+
+#endif /* !_MACHINE_STDARG_H_ */