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diff --git a/libs/cassowary/cassowary/ClFDConstraint.h b/libs/cassowary/cassowary/ClFDConstraint.h
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+++ b/libs/cassowary/cassowary/ClFDConstraint.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
+//
+// ClFDConstraint.h
+
+#ifndef ClFDConstraint_H
+#define ClFDConstraint_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 "ClConstraint.h"
+
+
+// Just a node in the class hierarchy for now
+class ClFDConstraint : public ClConstraint {
+ private: typedef ClConstraint super;
+
+ public:
+  // Constructor
+  ClFDConstraint(const ClStrength &strength = ClsRequired(),
+		     double weight = 1.0) 
+      : ClConstraint(strength, weight) { }
+
+  virtual bool FIsOkayForSimplexSolver() const { return false; }
+
+ protected:
+
+};
+
+#endif