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diff --git a/libs/cassowary/cassowary/ClFDBinaryOneWayConstraint.h b/libs/cassowary/cassowary/ClFDBinaryOneWayConstraint.h
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+++ b/libs/cassowary/cassowary/ClFDBinaryOneWayConstraint.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
+//
+// ClFDBinaryOneWayConstraint.h
+
+#ifndef ClFDBinaryOneWayConstraint_H
+#define ClFDBinaryOneWayConstraint_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 "Cassowary.h"
+#include "ClFDConstraint.h"
+
+class ClLinearConstraint;
+
+// Just a node in the class hierarchy for now
+class ClFDBinaryOneWayConstraint : public ClFDConstraint {
+ private: typedef ClFDConstraint super;
+
+ public:
+
+  ClFDBinaryOneWayConstraint(ClVariable vRW, enum ClCnRelation rel, ClVariable vRO, 
+                             double coefficient = 1.0, double constant = 0.0,
+                             const ClStrength &strength = ClsRequired(),
+                             double weight = 1.0)
+      : ClFDConstraint(strength,weight), _vRW(vRW), _rel(rel), _vRO(vRO),
+        _coefficient(coefficient), _constant(constant)
+    { }
+  
+  ClFDBinaryOneWayConstraint(ClVariable vRW, enum ClCnRelation rel, double constant,
+                             const ClStrength &strength = ClsRequired(),
+                              double weight = 1.0)
+      : ClFDConstraint(strength,weight), _vRW(vRW), _rel(rel), _vRO(clvNil),
+        _coefficient(0), _constant(constant)
+    { }
+  
+  ClFDBinaryOneWayConstraint(const ClConstraint &cn);
+
+  static void EnsurePreconditionsForCn(const ClConstraint &cn);
+
+  static bool FCanConvertCn(const ClConstraint &cn);
+
+#ifndef CL_NO_IO
+  virtual ostream &PrintOn(ostream &xo) const
+    { 
+      xo << "FDCn: " << _vRW << " " << StrCnRelation(_rel) << " ";
+      if (_coefficient != 0) {
+        if (_coefficient != 1) xo << _coefficient << "*";
+        if (_vRO != clvNil) xo << _vRO;
+      }
+      if (_constant != 0) xo << " + " << _constant;
+      return xo;
+    }
+
+  friend ostream& operator<<(ostream &xos, const ClFDBinaryOneWayConstraint &constraint)
+    { return constraint.PrintOn(xos); }
+
+#endif
+
+  ClVariable ClvRW() const
+    { return _vRW; }
+  ClVariable ClvRO() const 
+    { return _vRO; }
+  enum ClCnRelation Relation() const 
+    { return _rel; }
+  double Coefficient() const 
+    { return _coefficient; }
+  double Constant() const 
+    { return _constant; }
+
+  bool IsInequality() const
+    { return (_rel != cnEQ && _rel != cnNEQ); }
+
+  bool IsStrictInequality() const
+    { return (_rel == cnGT || _rel == cnLT); }
+
+ protected:
+  ClVariable _vRW;
+  enum ClCnRelation _rel;
+  ClVariable _vRO;
+  double _coefficient;
+  double _constant;
+};
+
+#endif