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diff --git a/libstdc++/stl/set.h b/libstdc++/stl/set.h
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+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+#ifndef __SGI_STL_SET_H
+#define __SGI_STL_SET_H
+
+#include <tree.h>
+
+#ifndef __STL_LIMITED_DEFAULT_TEMPLATES
+template <class Key, class Compare = less<Key>, class Alloc = alloc>
+#else
+template <class Key, class Compare, class Alloc = alloc>
+#endif
+class set {
+public:
+  // typedefs:
+
+  typedef Key key_type;
+  typedef Key value_type;
+  typedef Compare key_compare;
+  typedef Compare value_compare;
+private:
+  typedef rb_tree<key_type, value_type, 
+                  identity<value_type>, key_compare, Alloc> rep_type;
+  rep_type t;  // red-black tree representing set
+public:
+  typedef rep_type::const_pointer pointer;
+  typedef rep_type::const_reference reference;
+  typedef rep_type::const_reference const_reference;
+  typedef rep_type::const_iterator iterator;
+  typedef rep_type::const_iterator const_iterator;
+  typedef rep_type::const_reverse_iterator reverse_iterator;
+  typedef rep_type::const_reverse_iterator const_reverse_iterator;
+  typedef rep_type::size_type size_type;
+  typedef rep_type::difference_type difference_type;
+
+  // allocation/deallocation
+
+  set() : t(Compare()) {}
+  explicit set(const Compare& comp) : t(comp) {}
+
+#ifdef __STL_MEMBER_TEMPLATES
+  template <class InputIterator>
+  set(InputIterator first, InputIterator last)
+    : t(Compare()) { t.insert_unique(first, last); }
+
+  template <class InputIterator>
+  set(InputIterator first, InputIterator last, const Compare& comp)
+    : t(comp) { t.insert_unique(first, last); }
+#else
+  set(const value_type* first, const value_type* last) 
+    : t(Compare()) { t.insert_unique(first, last); }
+  set(const value_type* first, const value_type* last, const Compare& comp)
+    : t(comp) { t.insert_unique(first, last); }
+
+  set(const_iterator first, const_iterator last)
+    : t(Compare()) { t.insert_unique(first, last); }
+  set(const_iterator first, const_iterator last, const Compare& comp)
+    : t(comp) { t.insert_unique(first, last); }
+#endif /* __STL_MEMBER_TEMPLATES */
+
+  set(const set<Key, Compare, Alloc>& x) : t(x.t) {}
+  set<Key, Compare, Alloc>& operator=(const set<Key, Compare, Alloc>& x) { 
+    t = x.t; 
+    return *this;
+  }
+
+  // accessors:
+
+  key_compare key_comp() const { return t.key_comp(); }
+  value_compare value_comp() const { return t.key_comp(); }
+  iterator begin() const { return t.begin(); }
+  iterator end() const { return t.end(); }
+  reverse_iterator rbegin() const { return t.rbegin(); } 
+  reverse_iterator rend() const { return t.rend(); }
+  bool empty() const { return t.empty(); }
+  size_type size() const { return t.size(); }
+  size_type max_size() const { return t.max_size(); }
+  void swap(set<Key, Compare, Alloc>& x) { t.swap(x.t); }
+
+  // insert/erase
+  typedef  pair<iterator, bool> pair_iterator_bool; 
+  pair<iterator,bool> insert(const value_type& x) { 
+    pair<rep_type::iterator, bool> p = t.insert_unique(x); 
+    return pair<iterator, bool>(p.first, p.second);
+  }
+  iterator insert(iterator position, const value_type& x) {
+    return t.insert_unique((rep_type::iterator&)position, x);
+  }
+#ifdef __STL_MEMBER_TEMPLATES
+  template <class InputIterator>
+  void insert(InputIterator first, InputIterator last) {
+    t.insert_unique(first, last);
+  }
+#else
+  void insert(const_iterator first, const_iterator last) {
+    t.insert_unique(first, last);
+  }
+  void insert(const value_type* first, const value_type* last) {
+    t.insert_unique(first, last);
+  }
+#endif /* __STL_MEMBER_TEMPLATES */
+  void erase(iterator position) { 
+    t.erase((rep_type::iterator&)position); 
+  }
+  size_type erase(const key_type& x) { 
+    return t.erase(x); 
+  }
+  void erase(iterator first, iterator last) { 
+    t.erase((rep_type::iterator&)first, 
+            (rep_type::iterator&)last); 
+  }
+  void clear() { t.clear(); }
+
+  // set operations:
+
+  iterator find(const key_type& x) const { return t.find(x); }
+  size_type count(const key_type& x) const { return t.count(x); }
+  iterator lower_bound(const key_type& x) const {
+    return t.lower_bound(x);
+  }
+  iterator upper_bound(const key_type& x) const {
+    return t.upper_bound(x); 
+  }
+  pair<iterator,iterator> equal_range(const key_type& x) const {
+    return t.equal_range(x);
+  }
+  friend bool operator==(const set&, const set&);
+  friend bool operator<(const set&, const set&);
+};
+
+template <class Key, class Compare, class Alloc>
+inline bool operator==(const set<Key, Compare, Alloc>& x, 
+                       const set<Key, Compare, Alloc>& y) {
+  return x.t == y.t;
+}
+
+template <class Key, class Compare, class Alloc>
+inline bool operator<(const set<Key, Compare, Alloc>& x, 
+                      const set<Key, Compare, Alloc>& y) {
+  return x.t < y.t;
+}
+
+#endif /* __SGI_STL_SET_H */