Index: include/support/newlib/xlocale.h
===================================================================
--- include/support/newlib/xlocale.h
+++ include/support/newlib/xlocale.h
@@ -16,7 +16,11 @@
 #include <clocale>
 #include <cwctype>
 #include <ctype.h>
+#if defined(__NEWLIB__) && (__NEWLIB__ == 2) \
+    && defined(__NEWLIB_MINOR__) && (__NEWLIB_MINOR__ >= 5) \
+    && (!defined(__POSIX_VISIBLE) || (__POSIX_VISIBLE < 200809))
 #include <support/xlocale/__nop_locale_mgmt.h>
+#endif
 #include <support/xlocale/__posix_l_fallback.h>
 #include <support/xlocale/__strtonum_fallback.h>