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diff --git a/src/translators/btparse/ast.h b/src/translators/btparse/ast.h
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+/* Abstract syntax tree
+ *
+ * Macros, definitions
+ *
+ * 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
+ * 1989-1995
+ */
+
+#ifndef ZZAST_H
+#define ZZAST_H
+
+#define zzastOvfChk														\
+			if ( zzast_sp <= 0 )                                        \
+            {                                                           \
+                fprintf(stderr, zzStackOvfMsg, __FILE__, __LINE__);    	\
+                exit(PCCTS_EXIT_FAILURE);                                               \
+            }
+
+#ifndef USER_DEFINED_AST
+#ifndef AST_FIELDS
+#define AST_FIELDS
+#endif
+
+typedef struct _ast {
+            struct _ast *right, *down;
+#ifdef zzAST_DOUBLE
+            struct _ast *left, *up;
+#endif
+            AST_FIELDS
+} AST;
+
+#else
+
+#ifdef zzAST_DOUBLE
+#define AST_REQUIRED_FIELDS   struct _ast *right, *down, *left, *up;
+#else
+#define AST_REQUIRED_FIELDS   struct _ast *right, *down;
+#endif
+
+#endif
+
+
+/* N o d e  a c c e s s  m a c r o s */
+#define zzchild(t)		(((t)==NULL)?NULL:(t->down))
+#define zzsibling(t)	(((t)==NULL)?NULL:(t->right))
+
+
+/* define global variables needed by #i stack */
+#define zzASTgvars												\
+	AST *zzastStack[ZZAST_STACKSIZE];							\
+	int zzast_sp = ZZAST_STACKSIZE;
+
+#define zzASTVars	AST *_ast = NULL, *_sibling = NULL, *_tail = NULL
+#define zzSTR		( (_tail==NULL)?(&_sibling):(&(_tail->right)) )
+#define zzastCur	(zzastStack[zzast_sp])
+#define zzastArg(i)	(zzastStack[zztsp-i])
+#define zzastPush(p) zzastOvfChk; zzastStack[--zzast_sp] = p;
+#define zzastDPush	--zzast_sp
+#define zzastMARK	zztsp=zzast_sp;		/* Save state of stack */
+#define zzastREL	zzast_sp=zztsp;		/* Return state of stack */
+#define zzrm_ast	{zzfree_ast(*_root); _tail = _sibling = (*_root)=NULL;}
+
+extern int zzast_sp;
+extern AST *zzastStack[];
+
+void zzlink(AST **, AST **, AST **);
+void zzsubchild(AST **, AST **, AST **);
+void zzsubroot(AST **, AST **, AST **);
+void zzpre_ast(AST *, void (*)(), void (*)(), void (*)());
+void zzfree_ast(AST *);
+AST *zztmake(AST *, ...);
+AST *zzdup_ast(AST *);
+void zztfree(AST *);
+void zzdouble_link(AST *, AST *, AST *);
+AST *zzastnew(void);
+#endif