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diff --git a/Source/cmFunctionBlocker.h b/Source/cmFunctionBlocker.h
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+++ b/Source/cmFunctionBlocker.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmFunctionBlocker_h
+#define cmFunctionBlocker_h
+
+#include "cmStandardIncludes.h"
+
+#include "cmExecutionStatus.h"
+#include "cmListFileCache.h"
+class cmMakefile;
+
+class cmFunctionBlocker
+{
+public:
+  /**
+   * should a function be blocked
+   */
+  virtual bool IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile& mf,
+                                 cmExecutionStatus& status) = 0;
+
+  /**
+   * should this function blocker be removed, useful when one function adds a
+   * blocker and another must remove it
+   */
+  virtual bool ShouldRemove(const cmListFileFunction&, cmMakefile&)
+  {
+    return false;
+  }
+
+  virtual ~cmFunctionBlocker() {}
+
+  /** Set/Get the context in which this blocker is created.  */
+  void SetStartingContext(cmListFileContext const& lfc)
+  {
+    this->StartingContext = lfc;
+  }
+  cmListFileContext const& GetStartingContext() const
+  {
+    return this->StartingContext;
+  }
+
+private:
+  cmListFileContext StartingContext;
+};
+
+#endif