diff --git a/libc/include/sys/cdefs_elf.h b/libc/include/sys/cdefs_elf.h
new file mode 100644
index 0000000..e051b1d
--- /dev/null
+++ b/libc/include/sys/cdefs_elf.h
@@ -0,0 +1,152 @@
+/*	$NetBSD: cdefs_elf.h,v 1.22 2005/02/26 22:25:34 perry Exp $	*/
+
+/*
+ * Copyright (c) 1995, 1996 Carnegie-Mellon University.
+ * All rights reserved.
+ *
+ * Author: Chris G. Demetriou
+ *
+ * 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 the
+ * rights to redistribute these changes.
+ */
+
+#ifndef _SYS_CDEFS_ELF_H_
+#define	_SYS_CDEFS_ELF_H_
+
+#ifdef __LEADING_UNDERSCORE
+#define	_C_LABEL(x)	__CONCAT(_,x)
+#define _C_LABEL_STRING(x)	"_"x
+#else
+#define	_C_LABEL(x)	x
+#define _C_LABEL_STRING(x)	x
+#endif
+
+#if __STDC__
+#define	___RENAME(x)	__asm__(___STRING(_C_LABEL(x)))
+#else
+#ifdef __LEADING_UNDERSCORE
+#define	___RENAME(x)	____RENAME(_/**/x)
+#define	____RENAME(x)	__asm__(___STRING(x))
+#else
+#define	___RENAME(x)	__asm__(___STRING(x))
+#endif
+#endif
+
+#define	__indr_reference(sym,alias)	/* nada, since we do weak refs */
+
+#if __STDC__
+#define	__strong_alias(alias,sym)	       				\
+    __asm__(".global " _C_LABEL_STRING(#alias) "\n"			\
+	    _C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
+
+#define	__weak_alias(alias,sym)						\
+    __asm__(".weak " _C_LABEL_STRING(#alias) "\n"			\
+	    _C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
+#define	__weak_extern(sym)						\
+    __asm__(".weak " _C_LABEL_STRING(#sym));
+#define	__warn_references(sym,msg)					\
+    __asm__(".section .gnu.warning." #sym "\n\t.ascii \"" msg "\"\n\t.text");
+
+#else /* !__STDC__ */
+
+#ifdef __LEADING_UNDERSCORE
+#define __weak_alias(alias,sym) ___weak_alias(_/**/alias,_/**/sym)
+#define	___weak_alias(alias,sym)					\
+    __asm__(".weak alias\nalias = sym");
+#else
+#define	__weak_alias(alias,sym)						\
+    __asm__(".weak alias\nalias = sym");
+#endif
+#ifdef __LEADING_UNDERSCORE
+#define __weak_extern(sym) ___weak_extern(_/**/sym)
+#define	___weak_extern(sym)						\
+    __asm__(".weak sym");
+#else
+#define	__weak_extern(sym)						\
+    __asm__(".weak sym");
+#endif
+#define	__warn_references(sym,msg)					\
+    __asm__(".section .gnu.warning.sym\n\t.ascii msg ; .text");
+
+#endif /* !__STDC__ */
+
+#if __STDC__
+#define	__SECTIONSTRING(_sec, _str)					\
+	__asm__(".section " #_sec "\n\t.asciz \"" _str "\"\n\t.previous")
+#else
+#define	__SECTIONSTRING(_sec, _str)					\
+	__asm__(".section _sec\n\t.asciz _str\n\t.previous")
+#endif
+
+#define	__IDSTRING(_n,_s)		__SECTIONSTRING(.ident,_s)
+
+#define	__RCSID(_s)			__IDSTRING(rcsid,_s)
+#define	__SCCSID(_s)
+#define __SCCSID2(_s)
+#if 0	/* XXX userland __COPYRIGHTs have \ns in them */
+#define	__COPYRIGHT(_s)			__SECTIONSTRING(.copyright,_s)
+#else
+#define	__COPYRIGHT(_s)							\
+	static const char copyright[]					\
+	    __attribute__((__unused__,__section__(".copyright"))) = _s
+#endif
+
+#define	__KERNEL_RCSID(_n, _s)		__RCSID(_s)
+#define	__KERNEL_SCCSID(_n, _s)
+#if 0	/* XXX see above */
+#define	__KERNEL_COPYRIGHT(_n, _s)	__COPYRIGHT(_s)
+#else
+#define	__KERNEL_COPYRIGHT(_n, _s)	__SECTIONSTRING(.copyright, _s)
+#endif
+
+#ifndef __lint__
+#define	__link_set_make_entry(set, sym)					\
+	static void const * const __link_set_##set##_sym_##sym		\
+	    __section("link_set_" #set) __used = &sym
+#define	__link_set_make_entry2(set, sym, n)				\
+	static void const * const __link_set_##set##_sym_##sym##_##n	\
+	    __section("link_set_" #set) __used = &sym[n]
+#else
+#define	__link_set_make_entry(set, sym)					\
+	extern void const * const __link_set_##set##_sym_##sym
+#define	__link_set_make_entry2(set, sym, n)				\
+	extern void const * const __link_set_##set##_sym_##sym##_##n
+#endif /* __lint__ */
+
+#define	__link_set_add_text(set, sym)	__link_set_make_entry(set, sym)
+#define	__link_set_add_rodata(set, sym)	__link_set_make_entry(set, sym)
+#define	__link_set_add_data(set, sym)	__link_set_make_entry(set, sym)
+#define	__link_set_add_bss(set, sym)	__link_set_make_entry(set, sym)
+#define	__link_set_add_text2(set, sym, n)   __link_set_make_entry2(set, sym, n)
+#define	__link_set_add_rodata2(set, sym, n) __link_set_make_entry2(set, sym, n)
+#define	__link_set_add_data2(set, sym, n)   __link_set_make_entry2(set, sym, n)
+#define	__link_set_add_bss2(set, sym, n)    __link_set_make_entry2(set, sym, n)
+
+#define	__link_set_decl(set, ptype)					\
+	extern ptype * const __start_link_set_##set[];			\
+	extern ptype * const __stop_link_set_##set[]			\
+
+#define	__link_set_start(set)	(__start_link_set_##set)
+#define	__link_set_end(set)	(__stop_link_set_##set)
+
+#define	__link_set_count(set)						\
+	(__link_set_end(set) - __link_set_start(set))
+
+#endif /* !_SYS_CDEFS_ELF_H_ */