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diff --git a/libs/cassowary/cassowary/ClFDConnectorVariable.h b/libs/cassowary/cassowary/ClFDConnectorVariable.h
new file mode 100644
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+++ b/libs/cassowary/cassowary/ClFDConnectorVariable.h
@@ -0,0 +1,89 @@
+// $Id$
+//
+// 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
+//
+// ClFDConnectorVariable.h
+
+#ifndef ClFDConnectorVariable_H
+#define ClFDConnectorVariable_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 <stdio.h>
+#include <map>
+#include <string>
+#include <list>
+#include "Cassowary.h"
+#include "ClVariable.h"
+#include "ClFDVariable.h"
+#include "ClLinearEquation.h"
+#include "ClSimplexSolver.h"
+
+/* Creates a new variable in the FD region
+   that sets clvFloat in solver (simplex region)
+   when it changes */
+class ClFDConnectorVariable : public ClFDVariable {
+public:
+  typedef ClFDVariable super;
+
+  ClFDConnectorVariable(string name, FDNumber Value, const list<FDNumber> &initial_domain,
+                        ClSimplexSolver &solver, ClVariable clvFloat) :
+      ClFDVariable(name,Value,initial_domain),
+      _solver(solver),
+      _clvFloat(clvFloat),
+      _pcnRequiredLink(new ClLinearEquation(clvFloat,Value))
+    { solver.AddConstraint(_pcnRequiredLink); }
+
+#ifndef CL_NO_IO
+  // Prints a semi-descriptive representation to the stream, using the
+  // name if there is one, and otherwise the hash number of this
+  // object.
+  //	EXAMPLE
+  //	  [x:10.0]		-- name = "x", Value = 10.0
+  virtual ostream &PrintOn(ostream &xo) const;
+#endif
+  
+  // permit overriding in subclasses in case something needs to be
+  // done when the Value is changed by the solver
+  // may be called when the Value hasn't actually changed -- just 
+  // means the solver is setting the external variable
+  virtual void ChangeValue(FDNumber Value)
+    { 
+      if (_value != Value) {
+        _value = Value;
+        cerr << "Updating " << _clvFloat << " now!" << endl;
+        _solver.RemoveConstraint(_pcnRequiredLink);
+        _pcnRequiredLink->ChangeConstant(_value);
+        _solver.AddConstraint(_pcnRequiredLink);
+      }
+    }
+
+private:
+
+  // similar to SetValue -- see caveat above -- made private for now
+  // since it's probably the wrong thing and is too easy to invoke
+  FDNumber operator=(FDNumber Value)
+    { _value = Value; return Value; }
+
+  // Copy constructor left undefined since we want to
+  // outlaw passing by Value!  Will get a link error if you
+  // try to use within ClFDConnectorVariable.c, compile-time error everywhere else
+  ClFDConnectorVariable(const ClFDConnectorVariable &);
+
+  ClSimplexSolver &_solver;
+
+  ClVariable _clvFloat;
+
+  ClLinearEquation *_pcnRequiredLink;
+  
+};
+
+#endif