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diff --git a/src/Variables_Set.cc b/src/Variables_Set.cc
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+++ b/src/Variables_Set.cc
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+/* Variables_Set class implementation (non-inline functions).
+   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/ . */
+
+#include <ppl-config.h>
+#include "Variables_Set.defs.hh"
+#include <iostream>
+
+namespace PPL = Parma_Polyhedra_Library;
+
+PPL::Variables_Set::Variables_Set(const Variable& v, const Variable& w)
+  : Base() {
+  for (dimension_type d = v.id(), last = w.id(); d <= last; ++d)
+    insert(d);
+}
+
+bool
+PPL::Variables_Set::OK() const {
+  for (const_iterator i = begin(), set_end = end(); i != set_end; ++i)
+    if (!Variable(*i).OK())
+      return false;
+  return true;
+}
+
+/*! \relates Parma_Polyhedra_Library::Variables_Set */
+std::ostream&
+PPL::IO_Operators::operator<<(std::ostream& s, const Variables_Set& vs) {
+  s << '{';
+  for (Variables_Set::const_iterator i = vs.begin(),
+	 vs_end = vs.end(); i != vs_end; ) {
+    s << ' ' << Variable(*i++);
+    if (i != vs_end)
+      s << ',';
+  }
+  s << " }";
+  return s;
+}
+
+void
+PPL::Variables_Set::ascii_dump(std::ostream& s) const {
+  dimension_type variables_set_size = size();
+  s << "\nvariables( " << variables_set_size << " )\n";
+  for (Variables_Set::const_iterator i = begin(),
+	 i_end = end(); i != i_end; ++i)
+    s << *i << " ";
+}
+
+PPL_OUTPUT_DEFINITIONS(Variables_Set)
+
+bool
+PPL::Variables_Set::ascii_load(std::istream& s) {
+  clear();
+  std::string str;
+ if (!(s >> str) || str != "variables(")
+    return false;
+
+  dimension_type size;
+
+  if (!(s >> size))
+    return false;
+
+  if (!(s >> str) || str != ")")
+    return false;
+
+  dimension_type variable_value;
+  for (dimension_type i = 0; i < size; ++i) {
+    if (!(s >> variable_value))
+      return false;
+    insert(variable_value);
+  }
+  return true;
+}