--- Makefile.orig	Thu Aug 19 22:10:22 2004
+++ Makefile	Thu Aug 19 22:10:29 2004
@@ -10,7 +10,7 @@
 CFLAGS=-g -O -I /usr/local/include/pf
 
 # Uncomment this if you are using pfflowd on OpenBSD <=3.4
-#CFLAGS+=-DOLD_PFSYNC
+CFLAGS+=-DOLD_PFSYNC
 
 TARGETS=pfflowd