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diff --git a/libstdc++-v3/include/c_compatibility/math.h b/libstdc++-v3/include/c_compatibility/math.h
index 4c4fd0a2..a7518d24 100644
--- a/libstdc++-v3/include/c_compatibility/math.h
+++ b/libstdc++-v3/include/c_compatibility/math.h
@@ -1,11 +1,12 @@
 // -*- C++ -*- compatibility header.
 
-// Copyright (C) 2002 Free Software Foundation, Inc.
+// Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+// 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
 // terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
 // any later version.
 
 // This library is distributed in the hope that it will be useful,
@@ -13,25 +14,25 @@
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 // GNU General Public License for more details.
 
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
 
-// As a special exception, you may use this file as part of a free software
-// library without restriction.  Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License.  This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
 
-#ifndef _CPP_MATH_H_
-#define _CPP_MATH_H_ 1
+/** @file math.h
+ *  This is a Standard C++ Library header.
+ */
 
 #include <cmath>
 
+#ifndef _GLIBCXX_MATH_H
+#define _GLIBCXX_MATH_H 1
+
+#ifdef _GLIBCXX_NAMESPACE_C
 using std::abs;
 using std::acos;
 using std::asin;
@@ -56,7 +57,7 @@ using std::fabs;
 using std::floor;
 using std::fmod;
 
-#if _GLIBCPP_USE_C99
+#if _GLIBCXX_USE_C99
 using std::fpclassify;
 using std::isfinite;
 using std::isinf;
@@ -72,3 +73,5 @@ using std::isunordered;
 #endif
 
 #endif
+
+#endif