allow for multiple parsers within one program

util/LLgen/src/extern.h

@@ -55,6 +55,7 @@ extern string	e_noopen;	/* Error message string used often */
 extern int	verbose;	/* Level of verbosity */
 extern int	wflag;		/* warnings? */
 extern string	lexical;	/* name of lexical analyser */
+extern string	prefix;		/* prefix of externals */
 extern string	onerror;	/* name of user error handler */
 extern int	ntneeded;	/* ntneeded = 1 if nonterminals are included
 				 * in the sets.