diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
new file mode 100644
index 0000000..fe7033d
--- /dev/null
+++ b/libc/include/sys/cdefs.h
@@ -0,0 +1,376 @@
+/*	$NetBSD: cdefs.h,v 1.58 2004/12/11 05:59:00 christos Exp $	*/
+
+/*
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Berkeley Software Design, Inc.
+ *
+ * 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.
+ *
+ *	@(#)cdefs.h	8.8 (Berkeley) 1/9/95
+ */
+
+#ifndef	_SYS_CDEFS_H_
+#define	_SYS_CDEFS_H_
+
+
+/* our implementation of wchar_t is only 8-bit - die die non-portable code */
+#undef  __WCHAR_TYPE__
+#define __WCHAR_TYPE__  unsigned char
+
+
+/*
+ * Macro to test if we're using a GNU C compiler of a specific vintage
+ * or later, for e.g. features that appeared in a particular version
+ * of GNU C.  Usage:
+ *
+ *	#if __GNUC_PREREQ__(major, minor)
+ *	...cool feature...
+ *	#else
+ *	...delete feature...
+ *	#endif
+ */
+#ifdef __GNUC__
+#define	__GNUC_PREREQ__(x, y)						\
+	((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) ||			\
+	 (__GNUC__ > (x)))
+#else
+#define	__GNUC_PREREQ__(x, y)	0
+#endif
+
+//XXX #include <machine/cdefs.h>
+
+/* BIONIC: simpler definition */
+#define __BSD_VISIBLE   1
+
+#include <sys/cdefs_elf.h>
+
+#if defined(__cplusplus)
+#define	__BEGIN_DECLS		extern "C" {
+#define	__END_DECLS		}
+#define	__static_cast(x,y)	static_cast<x>(y)
+#else
+#define	__BEGIN_DECLS
+#define	__END_DECLS
+#define	__static_cast(x,y)	(x)y
+#endif
+
+/*
+ * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
+ * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
+ * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
+ * in between its arguments.  __CONCAT can also concatenate double-quoted
+ * strings produced by the __STRING macro, but this only works with ANSI C.
+ */
+
+#define	___STRING(x)	__STRING(x)
+#define	___CONCAT(x,y)	__CONCAT(x,y)
+
+#if __STDC__ || defined(__cplusplus)
+#define	__P(protos)	protos		/* full-blown ANSI C */
+#define	__CONCAT(x,y)	x ## y
+#define	__STRING(x)	#x
+
+#define	__const		const		/* define reserved names to standard */
+#define	__signed	signed
+#define	__volatile	volatile
+#if defined(__cplusplus)
+#define	__inline	inline		/* convert to C++ keyword */
+#else
+#if !defined(__GNUC__) && !defined(__lint__)
+#define	__inline			/* delete GCC keyword */
+#endif /* !__GNUC__  && !__lint__ */
+#endif /* !__cplusplus */
+
+#else	/* !(__STDC__ || __cplusplus) */
+#define	__P(protos)	()		/* traditional C preprocessor */
+#define	__CONCAT(x,y)	x/**/y
+#define	__STRING(x)	"x"
+
+#ifndef __GNUC__
+#define	__const				/* delete pseudo-ANSI C keywords */
+#define	__inline
+#define	__signed
+#define	__volatile
+#endif	/* !__GNUC__ */
+
+/*
+ * In non-ANSI C environments, new programs will want ANSI-only C keywords
+ * deleted from the program and old programs will want them left alone.
+ * Programs using the ANSI C keywords const, inline etc. as normal
+ * identifiers should define -DNO_ANSI_KEYWORDS.
+ */
+#ifndef	NO_ANSI_KEYWORDS
+#define	const		__const		/* convert ANSI C keywords */
+#define	inline		__inline
+#define	signed		__signed
+#define	volatile	__volatile
+#endif /* !NO_ANSI_KEYWORDS */
+#endif	/* !(__STDC__ || __cplusplus) */
+
+/*
+ * Used for internal auditing of the NetBSD source tree.
+ */
+#ifdef __AUDIT__
+#define	__aconst	__const
+#else
+#define	__aconst
+#endif
+
+/*
+ * The following macro is used to remove const cast-away warnings
+ * from gcc -Wcast-qual; it should be used with caution because it
+ * can hide valid errors; in particular most valid uses are in
+ * situations where the API requires it, not to cast away string
+ * constants. We don't use *intptr_t on purpose here and we are
+ * explicit about unsigned long so that we don't have additional
+ * dependencies.
+ */
+#define __UNCONST(a)	((void *)(unsigned long)(const void *)(a))
+
+/*
+ * GCC2 provides __extension__ to suppress warnings for various GNU C
+ * language extensions under "-ansi -pedantic".
+ */
+#if !__GNUC_PREREQ__(2, 0)
+#define	__extension__		/* delete __extension__ if non-gcc or gcc1 */
+#endif
+
+/*
+ * GCC1 and some versions of GCC2 declare dead (non-returning) and
+ * pure (no side effects) functions using "volatile" and "const";
+ * unfortunately, these then cause warnings under "-ansi -pedantic".
+ * GCC2 uses a new, peculiar __attribute__((attrs)) style.  All of
+ * these work for GNU C++ (modulo a slight glitch in the C++ grammar
+ * in the distribution version of 2.5.5).
+ */
+#if !__GNUC_PREREQ__(2, 5)
+#define	__attribute__(x)	/* delete __attribute__ if non-gcc or gcc1 */
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+#define	__dead		__volatile
+#define	__pure		__const
+#endif
+#endif
+
+/* Delete pseudo-keywords wherever they are not available or needed. */
+#ifndef __dead
+#define	__dead
+#define	__pure
+#endif
+
+#if __GNUC_PREREQ__(2, 7)
+#define	__unused	__attribute__((__unused__))
+#else
+#define	__unused	/* delete */
+#endif
+
+#if __GNUC_PREREQ__(3, 1)
+#define	__used		__attribute__((__used__))
+#else
+#define	__used		/* delete */
+#endif
+
+#if __GNUC_PREREQ__(2, 7)
+#define	__packed	__attribute__((__packed__))
+#define	__aligned(x)	__attribute__((__aligned__(x)))
+#define	__section(x)	__attribute__((__section__(x)))
+#elif defined(__lint__)
+#define	__packed	/* delete */
+#define	__aligned(x)	/* delete */
+#define	__section(x)	/* delete */
+#else
+#define	__packed	error: no __packed for this compiler
+#define	__aligned(x)	error: no __aligned for this compiler
+#define	__section(x)	error: no __section for this compiler
+#endif
+
+#if !__GNUC_PREREQ__(2, 8)
+#define	__extension__
+#endif
+
+#if __GNUC_PREREQ__(2, 8)
+#define __statement(x)	__extension__(x)
+#elif defined(lint)
+#define __statement(x)	(0)
+#else
+#define __statement(x)	(x)
+#endif
+
+/*
+ * C99 defines the restrict type qualifier keyword, which was made available
+ * in GCC 2.92.
+ */
+#if __STDC_VERSION__ >= 199901L
+#define	__restrict	restrict
+#else
+#if !__GNUC_PREREQ__(2, 92)
+#define	__restrict	/* delete __restrict when not supported */
+#endif
+#endif
+
+/*
+ * C99 defines __func__ predefined identifier, which was made available
+ * in GCC 2.95.
+ */
+#if !(__STDC_VERSION__ >= 199901L)
+#if __GNUC_PREREQ__(2, 6)
+#define	__func__	__PRETTY_FUNCTION__
+#elif __GNUC_PREREQ__(2, 4)
+#define	__func__	__FUNCTION__
+#else
+#define	__func__	""
+#endif
+#endif /* !(__STDC_VERSION__ >= 199901L) */
+
+#if defined(_KERNEL)
+#if defined(NO_KERNEL_RCSIDS)
+#undef __KERNEL_RCSID
+#define	__KERNEL_RCSID(_n, _s)		/* nothing */
+#endif /* NO_KERNEL_RCSIDS */
+#endif /* _KERNEL */
+
+#if !defined(_STANDALONE) && !defined(_KERNEL)
+#ifdef __GNUC__
+#define	__RENAME(x)	___RENAME(x)
+#else
+#ifdef __lint__
+#define	__RENAME(x)	__symbolrename(x)
+#else
+#error "No function renaming possible"
+#endif /* __lint__ */
+#endif /* __GNUC__ */
+#else /* _STANDALONE || _KERNEL */
+#define	__RENAME(x)	no renaming in kernel or standalone environment
+#endif
+
+/*
+ * A barrier to stop the optimizer from moving code or assume live
+ * register values. This is gcc specific, the version is more or less
+ * arbitrary, might work with older compilers.
+ */
+#if __GNUC_PREREQ__(2, 95)
+#define	__insn_barrier()	__asm __volatile("":::"memory")
+#else
+#define	__insn_barrier()	/* */
+#endif
+
+/*
+ * GNU C version 2.96 adds explicit branch prediction so that
+ * the CPU back-end can hint the processor and also so that
+ * code blocks can be reordered such that the predicted path
+ * sees a more linear flow, thus improving cache behavior, etc.
+ *
+ * The following two macros provide us with a way to use this
+ * compiler feature.  Use __predict_true() if you expect the expression
+ * to evaluate to true, and __predict_false() if you expect the
+ * expression to evaluate to false.
+ *
+ * A few notes about usage:
+ *
+ *	* Generally, __predict_false() error condition checks (unless
+ *	  you have some _strong_ reason to do otherwise, in which case
+ *	  document it), and/or __predict_true() `no-error' condition
+ *	  checks, assuming you want to optimize for the no-error case.
+ *
+ *	* Other than that, if you don't know the likelihood of a test
+ *	  succeeding from empirical or other `hard' evidence, don't
+ *	  make predictions.
+ *
+ *	* These are meant to be used in places that are run `a lot'.
+ *	  It is wasteful to make predictions in code that is run
+ *	  seldomly (e.g. at subsystem initialization time) as the
+ *	  basic block reordering that this affects can often generate
+ *	  larger code.
+ */
+#if __GNUC_PREREQ__(2, 96)
+#define	__predict_true(exp)	__builtin_expect((exp) != 0, 1)
+#define	__predict_false(exp)	__builtin_expect((exp) != 0, 0)
+#else
+#define	__predict_true(exp)	(exp)
+#define	__predict_false(exp)	(exp)
+#endif
+
+#if __GNUC_PREREQ__(2, 96)
+#define __noreturn    __attribute__((__noreturn__))
+#define __mallocfunc  __attribute__((malloc))
+#else
+#define __noreturn
+#define __mallocfunc
+#endif
+
+/*
+ * Macros for manipulating "link sets".  Link sets are arrays of pointers
+ * to objects, which are gathered up by the linker.
+ *
+ * Object format-specific code has provided us with the following macros:
+ *
+ *	__link_set_add_text(set, sym)
+ *		Add a reference to the .text symbol `sym' to `set'.
+ *
+ *	__link_set_add_rodata(set, sym)
+ *		Add a reference to the .rodata symbol `sym' to `set'.
+ *
+ *	__link_set_add_data(set, sym)
+ *		Add a reference to the .data symbol `sym' to `set'.
+ *
+ *	__link_set_add_bss(set, sym)
+ *		Add a reference to the .bss symbol `sym' to `set'.
+ *
+ *	__link_set_decl(set, ptype)
+ *		Provide an extern declaration of the set `set', which
+ *		contains an array of the pointer type `ptype'.  This
+ *		macro must be used by any code which wishes to reference
+ *		the elements of a link set.
+ *
+ *	__link_set_start(set)
+ *		This points to the first slot in the link set.
+ *
+ *	__link_set_end(set)
+ *		This points to the (non-existent) slot after the last
+ *		entry in the link set.
+ *
+ *	__link_set_count(set)
+ *		Count the number of entries in link set `set'.
+ *
+ * In addition, we provide the following macros for accessing link sets:
+ *
+ *	__link_set_foreach(pvar, set)
+ *		Iterate over the link set `set'.  Because a link set is
+ *		an array of pointers, pvar must be declared as "type **pvar",
+ *		and the actual entry accessed as "*pvar".
+ *
+ *	__link_set_entry(set, idx)
+ *		Access the link set entry at index `idx' from set `set'.
+ */
+#define	__link_set_foreach(pvar, set)					\
+	for (pvar = __link_set_start(set); pvar < __link_set_end(set); pvar++)
+
+#define	__link_set_entry(set, idx)	(__link_set_begin(set)[idx])
+
+#define  __BIONIC__   1
+
+#endif /* !_SYS_CDEFS_H_ */