--- make.inc.orig	Tue Dec 29 15:53:17 1998
+++ make.inc	Tue Dec 29 15:54:53 1998
@@ -52,7 +52,8 @@
 RANLIB=		/bin/true
 AR=		ar cq
 RM=		rm -f
-CFLAGS=		-O $(DEFINES) $(INCDIRS) $(ARCH) $(TIMER) $(TERMIO)
+CFLAGS?=	-O
+CFLAGS+=	$(DEFINES) $(INCDIRS) $(ARCH) $(TIMER) $(TERMIO)
 ARCH=		-DSVR4 -Di386
 TIMER=		-DUSE_SELECT
 TERMIO=		-DUSE_TERMIOS