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diff --git a/Source/cmUnixDefinesCommand.h b/Source/cmUnixDefinesCommand.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 cmUnixDefinesCommand_h
+#define cmUnixDefinesCommand_h
+
+#include "cmStandardIncludes.h"
+#include "cmCommand.h"
+
+/** \class cmUnixDefinesCommand
+ * \brief Specify a list of compiler defines for Unix platforms.
+ *
+ * cmUnixDefinesCommand specifies a list of compiler defines for Unix platforms
+ * only. This defines will be added to the compile command.
+ */
+class cmUnixDefinesCommand : public cmCommand
+{
+public:
+  /**
+   * Constructor.
+   */
+  cmUnixDefinesCommand();
+
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmUnixDefinesCommand;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool Invoke(std::vector<std::string>& args);
+
+  /**
+   * This determines if the command gets propagated down
+   * to makefiles located in subdirectories.
+   */
+  virtual bool IsInherited() {return true;}
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() { return "UNIX_DEFINES";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Add -D flags to the command line for Unix only.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "UNIX_DEFINES(-DFOO -DBAR)\n"
+      "Add -D flags to the command line for Unix only.";
+    }
+};
+
+
+
+#endif