The option has been deprecated for almost 7 years by now.
ok tb@
-# $OpenBSD: bsd.dep.mk,v 1.12 2016/09/04 00:34:29 patrick Exp $
+# $OpenBSD: bsd.dep.mk,v 1.13 2017/05/31 07:48:04 anton Exp $
# $NetBSD: bsd.dep.mk,v 1.12 1995/09/27 01:15:09 christos Exp $
# some of the rules involve .h sources, so remove them from mkdep line
.if !target(tags)
. if defined(SRCS)
tags: ${SRCS} _SUBDIRUSE
- -cd ${.CURDIR}; ${CTAGS} -f /dev/stdout -d -t ${.ALLSRC:N*.h} | \
+ -cd ${.CURDIR}; ${CTAGS} -f /dev/stdout -d ${.ALLSRC:N*.h} | \
sed "s;\${.CURDIR}/;;" > tags
. else
tags: