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diff --git a/src/c_streambuf.defs.hh b/src/c_streambuf.defs.hh
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+/* c_streambuf class declaration.
+   Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
+   Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
+
+This file is part of the Parma Polyhedra Library (PPL).
+
+The PPL 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 of the License, or (at your
+option) any later version.
+
+The PPL 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 program; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
+
+For the most up-to-date information see the Parma Polyhedra Library
+site: http://www.cs.unipr.it/ppl/ . */
+
+#ifndef PPL_c_streambuf_defs_hh
+#define PPL_c_streambuf_defs_hh 1
+
+#include "c_streambuf.types.hh"
+#include <streambuf>
+
+class Parma_Polyhedra_Library::c_streambuf
+  : public std::basic_streambuf<char, std::char_traits<char> > {
+public:
+  //! Constructor.
+  c_streambuf();
+
+  //! Destructor.
+  virtual ~c_streambuf();
+
+protected:
+  /*! \brief
+    Gets a character in case of underflow.
+
+    \remarks
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.3.
+  */
+  int_type underflow();
+
+  /*! \brief
+    In case of underflow, gets a character and advances the next pointer.
+
+    \remarks
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.3.
+  */
+  int_type uflow();
+
+  /*! \brief
+    Gets a sequence of characters.
+
+    \remarks
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.3.
+  */
+  std::streamsize xsgetn(char_type* s, std::streamsize n);
+
+  /*! \brief
+    Puts character back in case of backup underflow.
+
+    \remarks
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.4.
+  */
+  int_type pbackfail(int_type c = traits_type::eof());
+
+  /*! \brief
+    Writes a sequence of characters.
+
+    \remarks
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.5.
+  */
+  std::streamsize xsputn(const char_type* s, std::streamsize n);
+
+  /*! \brief
+    Writes a character in case of overflow.
+
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.5.
+  */
+  int_type overflow(int_type c);
+
+  /*! \brief
+    Synchronizes the stream buffer.
+
+    Specified by ISO/IEC 14882:1998: 27.5.2.4.2.
+  */
+  int sync();
+
+private:
+  //! Character type of the streambuf.
+  typedef char char_type;
+
+  //! Traits type of the streambuf.
+  typedef std::char_traits<char_type> traits_type;
+
+  //! Integer type of the streambuf.
+  typedef traits_type::int_type int_type;
+
+  //! Buffer for the last character read.
+  int_type ungetc_buf;
+
+  //! Buffer for next character
+  int_type nextc_buf;
+
+  virtual size_t cb_read(char *, size_t) {
+    return 0;
+  }
+  virtual size_t cb_write(const char *, size_t) {
+    return 0;
+  }
+  virtual int cb_sync() {
+    return 0;
+  }
+  virtual int cb_flush() {
+    return 0;
+  }
+};
+
+#include "c_streambuf.inlines.hh"
+
+#endif // !defined(PPL_c_streambuf_defs_hh)