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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: $
+ */
+
+/*
+ * 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
+ *
+ */
+
+#ifndef _POSIX_VERSION
+#define _POSIX_VERSION 199009L
+#endif
+
+/* Test for visibility of pre-existing POSIX.4 features that should really
+ * be conditional. If _POSIX_C_SOURCE and _POSIX_SOURCE are not
+ * defined then permit the pre-existing features to show up:
+ */
+#if !defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
+#define _POSIX4_VISIBLE_HISTORICALLY
+#endif
+
+/* Test for visibility of additional POSIX.4 features:
+ */
+#if _POSIX_VERSION >= 199309L && \
+ (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE >= 199309L)
+#define _POSIX4_VISIBLE
+#define _POSIX4_VISIBLE_HISTORICALLY
+#endif
+
+/* I'm not sure if I'm allowed to do this, but at least initially
+ * it may catch some teething problems:
+ */
+
+#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE > _POSIX_VERSION)
+#error _POSIX_C_SOURCE > _POSIX_VERSION
+#endif
+
+#define POSIX4_VISIBLE You missed the leading _!!
+#define POSIX4_VISIBLE_FORCEABLY You left the old define in the code!!
+
+#endif /* _SYS__POSIX_H_ */