Move exclusively to bison as parser generator.
diff --git a/maketab.c b/maketab.c
index 2384d51..433541e 100644
--- a/maketab.c
+++ b/maketab.c
@@ -25,14 +25,14 @@
 /*
  * this program makes the table to link function names
  * and type indices that is used by execute() in run.c.
- * it finds the indices in ytab.h, produced by yacc.
+ * it finds the indices in awkgram.tab.h, produced by bison.
  */
 
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include "awk.h"
-#include "ytab.h"
+#include "awkgram.tab.h"
 
 struct xx
 {	int token;
@@ -122,7 +122,7 @@
 
 	printf("#include <stdio.h>\n");
 	printf("#include \"awk.h\"\n");
-	printf("#include \"ytab.h\"\n\n");
+	printf("#include \"awkgram.tab.h\"\n\n");
 
 	if (argc != 2) {
 		fprintf(stderr, "usage: maketab YTAB_H\n");