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diff --git a/contrib/libstdc++/include/c_shadow/math.h b/contrib/libstdc++/include/c_shadow/math.h
new file mode 100644
index 0000000..f2ec04a
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+++ b/contrib/libstdc++/include/c_shadow/math.h
@@ -0,0 +1,131 @@
+// -*- C++ -*- header wrapper.
+
+// Copyright (C) 1997-1999, 2000 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)
+// 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.
+
+// 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.
+
+// 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.
+
+
+#ifndef  _INCLUDED_CPP_MATH_H_
+# define _INCLUDED_CPP_MATH_H_ 1
+
+# ifdef _IN_C_LEGACY_  /* sub-included by a C header */
+      // get out of the "legacy"
+    } // close extern "C"
+  }   // close namespace _C_legacy::
+#  undef _IN_C_LEGACY_
+#  define _MATH_NEED_C_LEGACY_
+# endif
+
+# include <cmath>
+
+  // Expose global C names, including non-standard ones, but shadow
+  // some names and types with the std:: C++ version.
+  using std::abs;
+  using std::acos;
+  using std::asin;
+  using std::atan;
+  using std::atan2;
+  using std::cos;
+  using std::sin;
+  using std::tan;
+  using std::cosh;
+  using std::sinh;
+  using std::tanh;
+  using std::exp;
+  using std::frexp;
+  using std::ldexp;
+  using std::log;
+  using std::log10;
+  using std::modf;
+  using std::pow;
+  using std::sqrt;
+  using std::ceil;
+  using std::fabs;
+  using std::floor;
+  using std::fmod;
+
+  // From ISO/IEC 9899:1999
+  using std::absf;
+  using std::acosf;
+  using std::asinf;
+  using std::atanf;
+  using std::atan2f;
+  using std::cosf;
+  using std::sinf;
+  using std::tanf;
+  using std::coshf;
+  using std::sinhf;
+  using std::tanhf;
+  using std::expf;
+  using std::frexpf;
+  using std::ldexpf;
+  using std::logf;
+  using std::log10f;
+  using std::modff;
+  using std::powf;
+  using std::sqrtf;
+  using std::ceilf;
+  using std::fabsf;
+  using std::floorf;
+  using std::fmodf;
+
+  // From ISO/IEC 9899:1999
+  using std::absl;
+  using std::acosl;
+  using std::asinl;
+  using std::atanl;
+  using std::atan2l;
+  using std::cosl;
+  using std::sinl;
+  using std::tanl;
+  using std::coshl;
+  using std::sinhl;
+  using std::tanhl;
+  using std::expl;
+  using std::frexpl;
+  using std::ldexpl;
+  using std::logl;
+  using std::log10l;
+  using std::modfl;
+  using std::powl;
+  using std::sqrtl;
+  using std::ceill;
+  using std::fabsl;
+  using std::floorl;
+  using std::fmodl;
+
+# ifdef _MATH_NEED_C_LEGACY_
+  // dive back into the "swamp"
+  namespace _C_legacy {
+    extern "C" {
+#  define _IN_C_LEGACY_
+#  undef _MATH_NEED_C_LEGACY_
+# endif /* _MATH_NEED_C_LEGACY_ */
+#endif /* _INCLUDED_CPP_MATH_H_ */
+
+
+
+