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diff --git a/libs/cassowary/cassowary/ClStrength.h b/libs/cassowary/cassowary/ClStrength.h
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+++ b/libs/cassowary/cassowary/ClStrength.h
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+// $Id$
+//
+// Cassowary Incremental Constraint Solver
+// Original Smalltalk Implementation by Alan Borning
+// This C++ Implementation by Greg J. Badros, <gjb@cs.washington.edu>
+// http://www.cs.washington.edu/homes/gjb
+// (C) 1998, 1999 Greg J. Badros and Alan Borning
+// See ../LICENSE for legal details regarding this software
+//
+// ClStrength.h
+
+#ifndef ClStrength_H
+#define ClStrength_H
+
+#if defined(HAVE_CONFIG_H) && !defined(CONFIG_H_INCLUDED) && !defined(CONFIG_INLINE_H_INCLUDED)
+#include <cassowary/config-inline.h>
+#define CONFIG_INLINE_H_INCLUDED
+#endif
+
+#include <string>
+
+#include "Cassowary.h"
+#include "ClSymbolicWeight.h"
+
+using std::string;
+
+class ClStrength;
+
+const ClStrength &ClsRequired();
+const ClStrength &ClsStrong();
+const ClStrength &ClsMedium();
+const ClStrength &ClsWeak();
+
+class ClStrength {
+ public:
+
+  ClStrength(const string &Name, const ClSymbolicWeight &symbolicWeight) :
+    _name(Name), _symbolicWeight(symbolicWeight)
+    { }
+
+  // special case for when nLevels = 3, should assert nLevels() == 3
+  ClStrength(const string &Name, double w1, double w2, double w3);
+
+  virtual ~ClStrength()
+    { }
+
+  virtual bool IsRequired() const
+    { return (_symbolicWeight == ClsRequired()._symbolicWeight); }
+
+#ifndef CL_NO_IO
+  virtual ostream &PrintOn(ostream &xo) const
+    { 
+    xo << Name(); 
+    if (!IsRequired())
+      xo << ":" << symbolicWeight(); 
+    return xo; 
+    }
+
+  friend ostream& operator<<(ostream &xos, const ClStrength &Cls)
+    { Cls.PrintOn(xos); return xos; }
+
+#endif
+
+  virtual const ClSymbolicWeight &symbolicWeight() const
+    { return _symbolicWeight; }
+
+  void SetPv(void *pv)
+    { _pv = pv; }
+
+  void *Pv() const
+    { return _pv; }
+
+ private:
+  string Name() const
+    { return _name; }
+
+  void SetName(string Name)
+    { _name = Name; }
+
+  void SetSymbolicWeight(const ClSymbolicWeight &symbolicWeight)
+    { _symbolicWeight = symbolicWeight; }
+
+  // instance variables
+  string _name;
+  ClSymbolicWeight _symbolicWeight;
+
+  void *_pv;
+
+};
+
+#endif