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	Do not define _XOPEN_SOURCE_EXTENDED on Solaris,
	notwithstanding comments in icu source.

--- source/common/uposixdefs.h	(revision 40154)
+++ source/common/uposixdefs.h	(working copy)
@@ -49,10 +49,13 @@
  * 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.
+ * [Experience with TeX Live is that it always causes failure.
+ *  http://tug.org/pipermail/tlbuild/2013q1/002493.html
+ *  http://tug.org/pipermail/tlbuild/2013q1/002536.html ]
  *
  * z/OS needs this definition for timeval and to get usleep.
  */
-#if !defined(_XOPEN_SOURCE_EXTENDED)
+#if !defined(_XOPEN_SOURCE_EXTENDED) && !defined(__sun)
 #   define _XOPEN_SOURCE_EXTENDED 1
 #endif