Index: include/support/newlib/xlocale.h
===================================================================
--- include/support/newlib/xlocale.h
+++ include/support/newlib/xlocale.h
@@ -16,7 +16,10 @@
 #include <clocale>
 #include <cwctype>
 #include <ctype.h>
+#if !defined(__NEWLIB__) || __NEWLIB__ < 2 || \
+    __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 5
 #include <support/xlocale/__nop_locale_mgmt.h>
+#endif
 #include <support/xlocale/__posix_l_fallback.h>
 #include <support/xlocale/__strtonum_fallback.h>