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diff --git a/StdLib/Include/sys/_posix.h b/StdLib/Include/sys/_posix.h
new file mode 100644
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+++ b/StdLib/Include/sys/_posix.h
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+#ifndef _SYS__POSIX_H_
+#define _SYS__POSIX_H_
+
+/*-
+ * Copyright (c) 1998 HD Associates, Inc.
+ * All rights reserved.
+ * contact: dufault@hda.com
+ *
+ * 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.
+ *
+ * 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.
+ *
+ *	$Id: _posix.h,v 1.1.1.1 2006/05/30 06:13:04 hhzhou Exp $
+ */
+
+/*
+ * This is a stand alone header file to set up for feature specification
+ * defined to take place before the inclusion of any standard header.
+ * It should only handle pre-processor defines.
+ *
+ * See section B.2.7 of 1003.1b-1993 
+ *
+ */
+
+#ifdef KERNEL
+
+#if !defined(ACTUALLY_LKM_NOT_KERNEL) && !defined(KLD_MODULE)
+#include "opt_posix.h"
+#endif
+
+/* Only kern_mib.c uses _POSIX_VERSION.  Introduce a kernel
+ * one to avoid other pieces of the kernel getting dependant
+ * on that.
+ * XXX Complain if you think this dumb.
+ */
+
+/* Make P1003 structures visible for the kernel if
+ * the P1003_1B option is in effect.
+ */
+#ifdef P1003_1B
+#define _P1003_1B_VISIBLE
+#ifndef _KPOSIX_VERSION
+#define	_KPOSIX_VERSION		199309L
+#endif
+#endif
+
+#ifndef _KPOSIX_VERSION
+#define	_KPOSIX_VERSION		199009L
+#endif
+
+#define _P1003_1B_VISIBLE_HISTORICALLY
+
+#else
+
+/* Default to existing user space version.
+ */
+#ifndef _POSIX_VERSION
+#define	_POSIX_VERSION		199009L
+#endif
+
+/* Test for visibility of P1003.1B features:
+ * If _POSIX_SOURCE and POSIX_C_SOURCE are completely undefined
+ * they show up.
+ *
+ * If they specify a version including P1003.1B then they show up.
+ *
+ * (Two macros are added to permit hiding new extensions while 
+ * keeping historic BSD features - that is not done now)
+ *
+ */
+
+#if (!defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)) || \
+ (_POSIX_VERSION  >= 199309L && defined(_POSIX_C_SOURCE) && \
+  _POSIX_C_SOURCE >= 199309L)
+#define _P1003_1B_VISIBLE
+#define _P1003_1B_VISIBLE_HISTORICALLY
+#endif
+
+#endif /* not KERNEL */
+#endif /* _SYS__POSIX_H_ */