style.Makefile:

Use WARNS?= instead of WARNS=

bin/csh/Makefile

@@ -16,7 +16,7 @@ DFLAGS= -D_PATH_TCSHELL='"/rescue/${PROG}"'
 DFLAGS= -D_PATH_TCSHELL='"/bin/${PROG}"'
 .endif
 CFLAGS+= -I. -I${.CURDIR} -I${TCSHDIR} ${DFLAGS}
-WARNS=	0
+WARNS?=	0
 SRCS=	sh.c sh.dir.c sh.dol.c sh.err.c sh.exec.c sh.char.c \
 	sh.exp.c sh.file.c sh.func.c sh.glob.c sh.hist.c sh.init.c \
 	sh.lex.c sh.misc.c sh.parse.c sh.print.c sh.proc.c sh.sem.c \

bin/ps/Makefile

@@ -3,7 +3,7 @@
 
 PROG=	ps
 SRCS=	fmt.c keyword.c nlist.c print.c ps.c
-WARNS=	5
+WARNS?=	5
 #
 # To support "lazy" ps for non root/wheel users
 # add -DLAZY_PS to the cflags.  This helps

bin/rmail/Makefile

@@ -8,7 +8,7 @@ PROG=	rmail
 SRCS=	rmail.c
 MAN=	rmail.8
 CFLAGS+=-I${SENDMAIL_DIR}/include -I.
-WARNS=	0
+WARNS?=	0
 WFORMAT=0
 
 .if exists(${.OBJDIR}/../../lib/libsm)

bin/sh/Makefile

@@ -21,7 +21,7 @@ LFLAGS= -8	# 8-bit lex scanner for arithmetic
 CFLAGS+=-DSHELL -I. -I${.CURDIR}
 # for debug:
 # CFLAGS+= -g -DDEBUG=2
-WARNS=	0
+WARNS?=	0
 WFORMAT=0
 
 .PATH:	${.CURDIR}/bltin \