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diff --git a/intl/icu/source/common/uposixdefs.h b/intl/icu/source/common/uposixdefs.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*   Copyright (C) 2011-2015, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*******************************************************************************
+*   file name:  uposixdefs.h
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2011jul25
+*   created by: Markus W. Scherer
+*
+*   Common definitions for implementation files working with POSIX functions.
+*   *Important*: #include this file before any other header files!
+*/
+
+#ifndef __UPOSIXDEFS_H__
+#define __UPOSIXDEFS_H__
+
+/*
+ * Define _XOPEN_SOURCE for access to POSIX functions.
+ *
+ * We cannot use U_PLATFORM from platform.h/utypes.h because
+ * "The Open Group Base Specifications"
+ * chapter "2.2 The Compilation Environment" says:
+ * "In the compilation of an application that #defines a feature test macro
+ * specified by IEEE Std 1003.1-2001,
+ * no header defined by IEEE Std 1003.1-2001 shall be included prior to
+ * the definition of the feature test macro."
+ */
+#ifdef _XOPEN_SOURCE
+    /* Use the predefined value. */
+#else
+    /*
+     * Version 6.0:
+     * The Open Group Base Specifications Issue 6 (IEEE Std 1003.1, 2004 Edition)
+     * also known as
+     * SUSv3 = Open Group Single UNIX Specification, Version 3 (UNIX03)
+     *
+     * Note: This definition used to be in C source code (e.g., putil.c)
+     * and define _XOPEN_SOURCE to different values depending on __STDC_VERSION__.
+     * In C++ source code (e.g., putil.cpp), __STDC_VERSION__ is not defined at all.
+     */
+#   define _XOPEN_SOURCE 600
+#endif
+
+/*
+ * Make sure things like readlink and such functions work.
+ * Poorly upgraded Solaris machines can't have this defined.
+ * Cleanly installed Solaris can use this #define.
+ *
+ * z/OS needs this definition for timeval and to get usleep.
+ */
+#if !defined(_XOPEN_SOURCE_EXTENDED)
+#   define _XOPEN_SOURCE_EXTENDED 1
+#endif
+
+/*
+ * There is an issue with turning on _XOPEN_SOURCE_EXTENDED on certain platforms.
+ * A compatibility issue exists between turning on _XOPEN_SOURCE_EXTENDED and using
+ * standard C++ string class. As a result, standard C++ string class needs to be
+ * turned off for the follwing platforms:
+ *  -AIX/VACPP
+ *  -Solaris/GCC
+ */
+#if (U_PLATFORM == U_PF_AIX && !defined(__GNUC__)) || (U_PLATFORM == U_PF_SOLARIS && defined(__GNUC__))
+#   if _XOPEN_SOURCE_EXTENDED && !defined(U_HAVE_STD_STRING)
+#   define U_HAVE_STD_STRING 0
+#   endif
+#endif
+
+#endif  /* __UPOSIXDEFS_H__ */