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diff --git a/libstdc++-v3/include/std/system_error b/libstdc++-v3/include/std/system_error
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+// <system_error> -*- C++ -*-
+
+// Copyright (C) 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 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 system_error
+ *  This is a Standard C++ Library header.
+ */
+
+#ifndef _GLIBCXX_SYSTEM_ERROR
+#define _GLIBCXX_SYSTEM_ERROR 1
+
+#pragma GCC system_header
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <c++0x_warning.h>
+#else
+
+#include <bits/c++config.h>
+#include <bits/error_constants.h>
+#include <iosfwd>
+#include <stdexcept>
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+  class error_code;
+  class error_condition;
+  class error_category;
+  class system_error;
+
+  /// is_error_code_enum
+  template<typename _Tp>
+    struct is_error_code_enum : public false_type { };
+
+  /// is_error_condition_enum
+  template<typename _Tp>
+    struct is_error_condition_enum : public false_type { };
+
+  template<> 
+    struct is_error_condition_enum<errc>
+    : public true_type { };
+
+
+  /// error_category
+  class error_category
+  {
+  protected:
+    error_category() = default;
+
+  public:
+    virtual ~error_category() { }
+
+    error_category(const error_category&) = delete;
+    error_category& operator=(const error_category&) = delete;
+
+    virtual const char* 
+    name() const = 0;
+
+    virtual string 
+    message(int) const = 0;
+
+    virtual error_condition
+    default_error_condition(int __i) const;
+
+    virtual bool 
+    equivalent(int __i, const error_condition& __cond) const;
+
+    virtual bool 
+    equivalent(const error_code& __code, int __i) const;
+
+    bool 
+    operator<(const error_category& __other) const
+    { return less<const error_category*>()(this, &__other); }
+
+    bool 
+    operator==(const error_category& __other) const
+    { return this == &__other; }
+
+    bool 
+    operator!=(const error_category& __other) const
+    { return this != &__other; }
+  };
+
+  // DR 890.
+  const error_category& system_category();
+  const error_category& generic_category();
+
+  error_code make_error_code(errc);
+
+  /// error_code
+  // Implementation-specific error identification
+  struct error_code
+  {
+    error_code()
+    : _M_value(0), _M_cat(&system_category()) { }
+
+    error_code(int __v, const error_category& __cat)
+    : _M_value(__v), _M_cat(&__cat) { }
+
+    template<typename _ErrorCodeEnum>
+      error_code(_ErrorCodeEnum __e,
+      typename enable_if<is_error_code_enum<_ErrorCodeEnum>::value>::type* = 0)
+      { *this = make_error_code(__e); }
+
+    void 
+    assign(int __v, const error_category& __cat)
+    {
+      _M_value = __v;
+      _M_cat = &__cat; 
+    }
+
+    void 
+    clear()
+    { assign(0, system_category()); }
+
+    // DR 804.
+    template<typename _ErrorCodeEnum>
+      typename enable_if<is_error_code_enum<_ErrorCodeEnum>::value,
+			 error_code&>::type
+      operator=(_ErrorCodeEnum __e)
+      { return *this = make_error_code(__e); }
+
+    int
+    value() const { return _M_value; }
+      
+    const error_category&  
+    category() const { return *_M_cat; }
+
+    error_condition 
+    default_error_condition() const;
+
+    string 
+    message() const
+    { return category().message(value()); }
+
+    // Safe bool idiom.
+    // explicit operator bool() const throw()
+    // { return _M_value != 0; }
+    typedef void (*__bool_type)();
+
+    static void __not_bool_type() { }
+
+    operator __bool_type() const
+    { return _M_value != 0 ? &__not_bool_type : false; }
+
+    // DR 804.
+  private:
+    int            		_M_value;
+    const error_category* 	_M_cat;
+  };
+
+  // 19.4.2.6 non-member functions
+  inline error_code
+  make_error_code(errc __e)
+  { return error_code(static_cast<int>(__e), generic_category()); }
+
+  inline bool
+  operator<(const error_code& __lhs, const error_code& __rhs)
+  { 
+    return (__lhs.category() < __rhs.category()
+	    || (__lhs.category() == __rhs.category()
+		&& __lhs.value() < __rhs.value()));
+  }
+
+  template<typename _CharT, typename _Traits>
+    basic_ostream<_CharT, _Traits>&
+    operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
+    { return (__os << __e.category().name() << ':' << __e.value()); }
+
+  error_condition make_error_condition(errc);
+
+  /// error_condition
+  // Portable error identification
+  struct error_condition 
+  {
+    error_condition()
+    : _M_value(0), _M_cat(&generic_category()) { }
+
+    error_condition(int __v, const error_category& __cat)     
+    : _M_value(__v), _M_cat(&__cat) { }
+
+    template<typename _ErrorConditionEnum>
+      error_condition(_ErrorConditionEnum __e,
+		      typename enable_if<is_error_condition_enum
+		                      <_ErrorConditionEnum>::value>::type* = 0)
+      { *this = make_error_condition(__e); }
+
+    void
+    assign(int __v, const error_category& __cat)
+    {
+      _M_value = __v;
+      _M_cat = &__cat;
+    }
+
+    // DR 804.
+    template<typename _ErrorConditionEnum>
+      typename enable_if<is_error_condition_enum
+			 <_ErrorConditionEnum>::value, error_condition&>::type
+      operator=(_ErrorConditionEnum __e)
+      { return *this = make_error_condition(__e); }
+
+    void 
+    clear()
+    { assign(0, generic_category()); }
+
+    // 19.4.3.4 observers
+    int 
+    value() const { return _M_value; }
+
+    const error_category&
+    category() const { return *_M_cat; }
+
+    string 
+    message() const
+    { return category().message(value()); }
+
+    // Safe bool idiom.
+    // explicit operator bool() const throw()
+    // { return _M_value != 0; }
+    typedef void (*__bool_type)();
+
+    static void __not_bool_type() { }
+
+    operator __bool_type() const
+    { return _M_value != 0 ? &__not_bool_type : false; }
+
+    // DR 804.
+  private:
+    int 			_M_value;
+    const error_category* 	_M_cat;
+  };
+
+  // 19.4.3.6 non-member functions
+  inline error_condition
+  make_error_condition(errc __e)
+  { return error_condition(static_cast<int>(__e), generic_category()); }
+
+  inline bool 
+  operator<(const error_condition& __lhs, const error_condition& __rhs)
+  {
+    return (__lhs.category() < __rhs.category()
+	    || (__lhs.category() == __rhs.category()
+		&& __lhs.value() < __rhs.value()));
+  }
+
+  // 19.4.4 Comparison operators
+  inline bool
+  operator==(const error_code& __lhs, const error_code& __rhs)
+  { return (__lhs.category() == __rhs.category()
+	    && __lhs.value() == __rhs.value()); }
+
+  inline bool
+  operator==(const error_code& __lhs, const error_condition& __rhs)
+  {
+    return (__lhs.category().equivalent(__lhs.value(), __rhs)
+	    || __rhs.category().equivalent(__lhs, __rhs.value()));
+  }
+
+  inline bool
+  operator==(const error_condition& __lhs, const error_code& __rhs)
+  {
+    return (__rhs.category().equivalent(__rhs.value(), __lhs)
+	    || __lhs.category().equivalent(__rhs, __lhs.value()));
+  }
+
+  inline bool
+  operator==(const error_condition& __lhs, const error_condition& __rhs)
+  {
+    return (__lhs.category() == __rhs.category()
+	    && __lhs.value() == __rhs.value());
+  }
+
+  inline bool
+  operator!=(const error_code& __lhs, const error_code& __rhs)
+  { return !(__lhs == __rhs); }
+
+  inline bool
+  operator!=(const error_code& __lhs, const error_condition& __rhs)
+  { return !(__lhs == __rhs); }
+
+  inline bool
+  operator!=(const error_condition& __lhs, const error_code& __rhs)
+  { return !(__lhs == __rhs); }
+
+  inline bool
+  operator!=(const error_condition& __lhs, const error_condition& __rhs)
+  { return !(__lhs == __rhs); }
+
+
+  /** 
+   *  @brief Thrown to indicate error code of underlying system.
+   *
+   *  @ingroup exceptions
+   */
+  class system_error : public std::runtime_error
+  {
+  private:
+    error_code 	_M_code;
+
+  public:
+    system_error(error_code __ec = error_code())
+    : runtime_error(""), _M_code(__ec) { }
+
+    system_error(error_code __ec, const string& __what)
+    : runtime_error(__what), _M_code(__ec) { }
+    
+    /*
+     * TODO: Add const char* ctors to all exceptions.
+     *
+     * system_error(error_code __ec, const char* __what)
+     * : runtime_error(__what), _M_code(__ec) { }
+     *
+     * system_error(int __v, const error_category& __ecat, const char* __what)
+     * : runtime_error(__what), _M_code(error_code(__v, __ecat)) { }
+     */
+
+    system_error(int __v, const error_category& __ecat)
+    : runtime_error(""), _M_code(error_code(__v, __ecat)) { }
+
+    system_error(int __v, const error_category& __ecat, const string& __what)
+    : runtime_error(__what), _M_code(error_code(__v, __ecat)) { }
+
+    virtual ~system_error() throw();
+
+    const error_code& 
+    code() const throw() { return _M_code; }
+  };
+
+_GLIBCXX_END_NAMESPACE
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+#endif // _GLIBCXX_SYSTEM_ERROR
+