--- /dev/null
+++ Libc/Libc-583/include/ucontext.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2002, 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*
+ * These routines are DEPRECATED and should not be used.
+ */
+#ifndef _UCONTEXT_H_
+#define _UCONTEXT_H_
+
+#include <sys/cdefs.h>
+
+//Begin-Libc
+#ifdef __LIBC__
+#include <sys/ucontext.h>
+__BEGIN_DECLS
+int  getcontext(ucontext_t *);
+void makecontext(ucontext_t *, void (*)(), int, ...);
+int  setcontext(const ucontext_t *);
+int  swapcontext(ucontext_t * __restrict, const ucontext_t * __restrict);
+__END_DECLS
+#else /* !__LIBC__ */
+//End-Libc
+#ifdef _XOPEN_SOURCE
+#include <sys/ucontext.h>
+
+__BEGIN_DECLS
+int  getcontext(ucontext_t *);
+void makecontext(ucontext_t *, void (*)(), int, ...);
+int  setcontext(const ucontext_t *);
+int  swapcontext(ucontext_t * __restrict, const ucontext_t * __restrict);
+__END_DECLS
+#else /* !_XOPEN_SOURCE */
+#error ucontext routines are deprecated, and require _XOPEN_SOURCE to be defined
+#endif /* _XOPEN_SOURCE */
+//Begin-Libc
+#endif /* __LIBC__ */
+//End-Libc
+
+#endif /* _UCONTEXT_H_ */