$NetBSD$

--- yacc/Makefile.orig	2005-03-24 11:39:56.000000000 +0000
+++ yacc/Makefile
@@ -17,7 +17,7 @@
 include ../config/Makefile
 
 CC=$(BYTECC)
-CFLAGS=-O -DNDEBUG $(BYTECCCOMPOPTS)
+CFLAGS+=-DNDEBUG $(BYTECCCOMPOPTS)
 
 OBJS= closure.o error.o lalr.o lr0.o main.o mkpar.o output.o reader.o \
   skeleton.o symtab.o verbose.o warshall.o