--- a/libstdc++-v3/include/tr1/cwctype	Thu Oct 25 07:37:49 2018 +0900
+++ b/libstdc++-v3/include/tr1/cwctype	Thu Feb 13 11:34:05 2020 +0900
@@ -1,6 +1,6 @@
 // TR1 cwctype -*- C++ -*-
 
-// Copyright (C) 2006-2018 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -37,12 +37,16 @@
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
 namespace tr1
 {
 #if _GLIBCXX_HAVE_ISWBLANK
   using std::iswblank;
 #endif  
 }
+
+_GLIBCXX_END_NAMESPACE_VERSION
 }
 
 #endif // _GLIBCXX_USE_WCHAR_T