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--- trio/triodef.h.orig 2015-03-30 08:21:24 UTC
+++ trio/triodef.h
@@ -185,12 +185,13 @@
# endif
#endif
-#if (_XOPEN_VERSION - 0 >= 3) || defined(_XOPEN_XPG3)
+#if (defined(_XOPEN_VERSION) && (_XOPEN_VERSION - 0 >= 3)) || defined(_XOPEN_XPG3)
# define PREDEF_STANDARD_XPG3
#endif
-#if (_XOPEN_VERSION - 0 >= 4) || defined(_XOPEN_XPG4)
+#if (defined(_XOPEN_VERSION) && (_XOPEN_VERSION - 0 >= 4)) || defined(_XOPEN_XPG4)
# define PREDEF_STANDARD_XPG4
#endif
+#if defined(_XOPEN_VERSION)
#if (_XOPEN_VERSION - 0 > 4) \
|| (defined(_XOPEN_UNIX) && (_XOPEN_VERSION - 0 == 4))
# define PREDEF_STANDARD_UNIX95
@@ -201,6 +202,7 @@
#if (_XOPEN_VERSION - 0 >= 600)
# define PREDEF_STANDARD_UNIX03
#endif
+#endif
/*************************************************************************
* Generic defines
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