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diff --git a/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenStream.h b/BaseTools/Source/C/VfrCompile/Pccts/h/ATokenStream.h
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+/* ANTLRTokenStream.h
+ *
+ * SOFTWARE RIGHTS
+ *
+ * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
+ * Set (PCCTS) -- PCCTS is in the public domain.  An individual or
+ * company may do whatever they wish with source code distributed with
+ * PCCTS or the code generated by PCCTS, including the incorporation of
+ * PCCTS, or its output, into commerical software.
+ *
+ * We encourage users to develop software with PCCTS.  However, we do ask
+ * that credit is given to us for developing PCCTS.  By "credit",
+ * we mean that if you incorporate our source code into one of your
+ * programs (commercial product, research project, or otherwise) that you
+ * acknowledge this fact somewhere in the documentation, research report,
+ * etc...  If you like PCCTS and have developed a nice tool with the
+ * output, please mention that you developed it using PCCTS.  In
+ * addition, we ask that this header remain intact in our source code.
+ * As long as these guidelines are kept, we expect to continue enhancing
+ * this system and expect to make other tools available as they are
+ * completed.
+ *
+ * ANTLR 1.33
+ * Terence Parr
+ * Parr Research Corporation
+ * with Purdue University and AHPCRC, University of Minnesota
+ * 1989-2000
+ */
+
+#ifndef ATOKENSTREAM_H_GATE
+#define ATOKENSTREAM_H_GATE
+
+#include "pcctscfg.h"
+
+/* This is really a behavior or protocol; it merely indicates the behavior
+ * required of the input and output of an ANTLRTokenBuffer.  You could
+ * subclass it, but you can also just pass any old pointer to ANTLRTokenBuffer
+ * with a type cast (in which case, your getANTLRToken() would have to
+ * explicitly cast the input pointer to your REAL type (typically your lexer)).
+ */
+
+class ANTLRParser;							// MR1
+
+class DllExportPCCTS ANTLRTokenStream {
+public:
+    virtual _ANTLRTokenPtr getToken() = 0;
+	virtual ANTLRParser * setParser(ANTLRParser * /*p MR23*/) {return 0; };   // MR12
+	virtual ANTLRParser * getParser() { return 0; };		        // MR12
+};
+
+#endif