removed %define api.prefix in yacc eval_expr.y, use -p bison on command line

src/Makefile.in

@@ -50,7 +50,7 @@ expandlabel.c expandlabel.h: expandlabel.y
 	bison -d -o expandlabel.c  expandlabel.y
 
 eval_expr.c: eval_expr.y
-	bison -o eval_expr.c eval_expr.y
+	bison -p kk -o eval_expr.c eval_expr.y
 
 parselabel.o: expandlabel.h
 

src/eval_expr.y

@@ -55,7 +55,7 @@ struct fn fn_array[]
     };
 %}
 
-%define api.prefix {kk}
+/* %define api.prefix {kk} */
 %union {
 int          c;
 double     val; /* For returning numbers. */