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diff --git a/libs/cassowary/cassowary/ClSlackVariable.h b/libs/cassowary/cassowary/ClSlackVariable.h
new file mode 100644
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+++ b/libs/cassowary/cassowary/ClSlackVariable.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
+//
+// ClSlackVariable.h
+
+#ifndef ClSlackVariable_H
+#define ClSlackVariable_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 "ClAbstractVariable.h"
+
+class ClTableau;
+class ClSimplexSolver;
+
+
+class ClSlackVariable : public ClAbstractVariable {
+public:
+#ifdef CL_FIND_LEAK
+  ~ClSlackVariable() { --cSlackVariables; };
+
+  static long cSlackVariables;
+#endif
+
+protected:
+  friend class ClTableau;
+  friend class ClSimplexSolver;
+
+  ClSlackVariable(string Name = "") :
+    ClAbstractVariable(Name)
+    {
+#ifdef CL_FIND_LEAK
+      ++cSlackVariables; 
+#endif
+    }
+
+  ClSlackVariable(long number, char *prefix) :
+    ClAbstractVariable(number,prefix)
+    { 
+#ifdef CL_FIND_LEAK
+      ++cSlackVariables; 
+#endif
+    }
+
+#ifndef CL_NO_IO
+  virtual ostream &PrintOn(ostream &xo) const
+  {  
+    xo << "[" << Name() << ":slack]";
+    return xo;
+  }
+#endif
+
+  virtual bool IsExternal() const
+    { return false; }
+
+  virtual bool IsPivotable() const
+    { return true; }
+
+  virtual bool IsRestricted() const
+    { return true; }
+
+};
+
+
+#endif