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diff --git a/Source/cmFunctionBlocker.h b/Source/cmFunctionBlocker.h
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+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+
+  Copyright (c) 2000 National Library of Medicine
+  All rights reserved.
+
+  See COPYRIGHT.txt for copyright details.
+
+=========================================================================*/
+#ifndef cmFunctionBlocker_h
+#define cmFunctionBlocker_h
+
+#include "cmStandardIncludes.h"
+class cmMakefile;
+
+/** \class cmFunctionBlocker
+ * \brief A class that defines an interface for blocking cmake functions
+ *
+ * This is the superclass for any classes that need to block a cmake function
+ */
+class cmFunctionBlocker
+{
+public:
+  /**
+   * should a function be blocked
+   */
+  virtual bool IsFunctionBlocked(const char *name, const std::vector<std::string> &args, 
+                                 const cmMakefile &mf) const = 0;
+
+  /**
+   * should this function blocker be removed, useful when one function adds a blocker
+   * and another must remove it
+   */
+  virtual bool ShouldRemove(const char *name, const std::vector<std::string> &args, 
+                            const cmMakefile &mf) const {return false;}
+};
+
+#endif