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diff --git a/libstdc++-v3/include/tr1/cfenv b/libstdc++-v3/include/tr1/cfenv
new file mode 100644
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+++ b/libstdc++-v3/include/tr1/cfenv
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+// TR1 cfenv -*- C++ -*-
+
+// Copyright (C) 2006, 2007, 2008, 2009, 2010 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 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// 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.
+
+// 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/>.
+
+/** @file tr1/cfenv
+ *  This is a TR1 C++ Library header. 
+ */
+
+#ifndef _GLIBCXX_TR1_CFENV
+#define _GLIBCXX_TR1_CFENV 1
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+
+#if _GLIBCXX_HAVE_FENV_H
+# include <fenv.h>
+#endif
+
+#ifdef _GLIBCXX_USE_C99_FENV_TR1
+
+#undef feclearexcept
+#undef fegetexceptflag
+#undef feraiseexcept
+#undef fesetexceptflag
+#undef fetestexcept
+#undef fegetround
+#undef fesetround
+#undef fegetenv
+#undef feholdexcept
+#undef fesetenv
+#undef feupdateenv
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+namespace tr1
+{
+  // types
+  using ::fenv_t;
+  using ::fexcept_t;
+
+  // functions
+  using ::feclearexcept;
+  using ::fegetexceptflag;
+  using ::feraiseexcept;
+  using ::fesetexceptflag;
+  using ::fetestexcept;
+
+  using ::fegetround;
+  using ::fesetround;
+
+  using ::fegetenv;
+  using ::feholdexcept;
+  using ::fesetenv;
+  using ::feupdateenv;
+}
+}
+
+#endif // _GLIBCXX_USE_C99_FENV_TR1
+
+#endif // _GLIBCXX_TR1_CFENV