diff --git a/include/stdlib/stddef.h b/include/stdlib/stddef.h
new file mode 100644
index 0000000..ea88214
--- /dev/null
+++ b/include/stdlib/stddef.h
@@ -0,0 +1,64 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  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 REGENTS 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 REGENTS 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.
+ *
+ *	@(#)stddef.h	8.1 (Berkeley) 6/2/93
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _STDDEF_H_
+#define _STDDEF_H_
+
+#include <sys/cdefs.h>
+#include <sys/_null.h>
+#include <sys/_types.h>
+
+typedef	__ptrdiff_t	ptrdiff_t;
+
+#if __BSD_VISIBLE
+#ifndef _RUNE_T_DECLARED
+typedef	__rune_t	rune_t;
+#define	_RUNE_T_DECLARED
+#endif
+#endif
+
+#ifndef _SIZE_T_DECLARED
+typedef	__size_t	size_t;
+#define	_SIZE_T_DECLARED
+#endif
+
+#ifndef	__cplusplus
+#ifndef _WCHAR_T_DECLARED
+typedef	__wchar_t	wchar_t;
+#define	_WCHAR_T_DECLARED
+#endif
+#endif
+
+#define	offsetof(type, member)	__offsetof(type, member)
+
+#endif /* _STDDEF_H_ */