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diff --git a/include/c++/stl/stl/_iosfwd.h b/include/c++/stl/stl/_iosfwd.h
new file mode 100644
index 0000000..64c6430
--- /dev/null
+++ b/include/c++/stl/stl/_iosfwd.h
@@ -0,0 +1,159 @@
+#ifndef _STLP_INTERNAL_IOSFWD
+#define _STLP_INTERNAL_IOSFWD
+
+#if defined (__sgi) && !defined (__GNUC__) && !defined (_STANDARD_C_PLUS_PLUS)
+#  error This header file requires the -LANG:std option
+#endif
+
+// This file provides forward declarations of the most important I/O
+// classes.  Note that almost all of those classes are class templates,
+// with default template arguments.  According to the C++ standard,
+// if a class template is declared more than once in the same scope
+// then only one of those declarations may have default arguments.
+
+// <iosfwd> contains the same declarations as other headers, and including
+// both <iosfwd> and (say) <iostream> is permitted.  This means that only
+// one header may contain those default template arguments.
+
+// In this implementation, the declarations in <iosfwd> contain default
+// template arguments.  All of the other I/O headers include <iosfwd>.
+
+#ifndef _STLP_CHAR_TRAITS_H
+#  include <stl/char_traits.h>
+#endif
+
+_STLP_BEGIN_NAMESPACE
+
+class ios_base;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_ios;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_streambuf;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_istream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_ostream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_iostream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM( _Traits , char_traits<_CharT>),
+          _STLP_DFL_TMPL_PARAM(_Allocator , allocator<_CharT>) >
+class basic_stringbuf;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>),
+          _STLP_DFL_TMPL_PARAM(_Allocator , allocator<_CharT>) >
+class basic_istringstream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>),
+          _STLP_DFL_TMPL_PARAM(_Allocator , allocator<_CharT>) >
+class basic_ostringstream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>),
+          _STLP_DFL_TMPL_PARAM(_Allocator , allocator<_CharT>) >
+class basic_stringstream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_filebuf;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_ifstream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_ofstream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class basic_fstream;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class istreambuf_iterator;
+
+template <class _CharT, _STLP_DFL_TMPL_PARAM(_Traits , char_traits<_CharT>) >
+class ostreambuf_iterator;
+
+typedef basic_ios<char, char_traits<char> >    ios;
+
+#if !defined (_STLP_NO_WCHAR_T)
+typedef basic_ios<wchar_t, char_traits<wchar_t> > wios;
+#endif
+
+// Forward declaration of class locale, and of the most important facets.
+class locale;
+#if defined (_STLP_NO_EXPLICIT_FUNCTION_TMPL_ARGS)
+template <class _Facet>
+struct _Use_facet {
+  const locale& __loc;
+  _Use_facet(const locale& __p_loc) : __loc(__p_loc) {}
+  inline const _Facet& operator *() const;
+};
+#  define use_facet *_Use_facet
+#else
+template <class _Facet> inline const _Facet& use_facet(const locale&);
+#endif
+
+template <class _CharT> class ctype;
+template <class _CharT> class ctype_byname;
+template <class _CharT> class collate;
+template <class _CharT> class collate_byname;
+
+_STLP_TEMPLATE_NULL class ctype<char>;
+_STLP_TEMPLATE_NULL class ctype_byname<char>;
+_STLP_TEMPLATE_NULL class collate<char>;
+_STLP_TEMPLATE_NULL class collate_byname<char>;
+
+#if !defined (_STLP_NO_WCHAR_T)
+_STLP_TEMPLATE_NULL class ctype<wchar_t>;
+_STLP_TEMPLATE_NULL class ctype_byname<wchar_t>;
+_STLP_TEMPLATE_NULL class collate<wchar_t>;
+_STLP_TEMPLATE_NULL class collate_byname<wchar_t>;
+#endif
+
+#if !(defined (__SUNPRO_CC) && __SUNPRO_CC < 0x500 )
+// Typedefs for ordinary (narrow-character) streams.
+//_STLP_TEMPLATE_NULL class basic_streambuf<char, char_traits<char> >;
+#endif
+
+typedef basic_istream<char, char_traits<char> >  istream;
+typedef basic_ostream<char, char_traits<char> >  ostream;
+typedef basic_iostream<char, char_traits<char> > iostream;
+typedef basic_streambuf<char,char_traits<char> > streambuf;
+
+typedef basic_stringbuf<char, char_traits<char>, allocator<char> >     stringbuf;
+typedef basic_istringstream<char, char_traits<char>, allocator<char> > istringstream;
+typedef basic_ostringstream<char, char_traits<char>, allocator<char> > ostringstream;
+typedef basic_stringstream<char, char_traits<char>, allocator<char> >  stringstream;
+
+typedef basic_filebuf<char, char_traits<char> >  filebuf;
+typedef basic_ifstream<char, char_traits<char> > ifstream;
+typedef basic_ofstream<char, char_traits<char> > ofstream;
+typedef basic_fstream<char, char_traits<char> >  fstream;
+
+#if !defined (_STLP_NO_WCHAR_T)
+// Typedefs for wide-character streams.
+typedef basic_streambuf<wchar_t, char_traits<wchar_t> > wstreambuf;
+typedef basic_istream<wchar_t, char_traits<wchar_t> >   wistream;
+typedef basic_ostream<wchar_t, char_traits<wchar_t> >   wostream;
+typedef basic_iostream<wchar_t, char_traits<wchar_t> >  wiostream;
+
+typedef basic_stringbuf<wchar_t, char_traits<wchar_t>, allocator<wchar_t> >     wstringbuf;
+typedef basic_istringstream<wchar_t, char_traits<wchar_t>, allocator<wchar_t> > wistringstream;
+typedef basic_ostringstream<wchar_t, char_traits<wchar_t>, allocator<wchar_t> > wostringstream;
+typedef basic_stringstream<wchar_t, char_traits<wchar_t>, allocator<wchar_t> >  wstringstream;
+
+typedef basic_filebuf<wchar_t, char_traits<wchar_t> >  wfilebuf;
+typedef basic_ifstream<wchar_t, char_traits<wchar_t> > wifstream;
+typedef basic_ofstream<wchar_t, char_traits<wchar_t> > wofstream;
+typedef basic_fstream<wchar_t, char_traits<wchar_t> >  wfstream;
+#endif
+
+_STLP_END_NAMESPACE
+
+#endif
+
+// Local Variables:
+// mode:C++
+// End: