[src/trunk]: src/sys/conf Use += for SYSTEM_DEP not ?=

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2da818443f70
branches:  trunk
changeset: 787982:2da818443f70
user:      matt <matt%NetBSD.org@localhost>
date:      Wed Jul 17 14:05:43 2013 +0000

description:
Use += for SYSTEM_DEP not ?=

diffstat:

 sys/conf/Makefile.kern.inc |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r 7f60cf510f08 -r 2da818443f70 sys/conf/Makefile.kern.inc
--- a/sys/conf/Makefile.kern.inc        Wed Jul 17 12:55:48 2013 +0000
+++ b/sys/conf/Makefile.kern.inc        Wed Jul 17 14:05:43 2013 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile.kern.inc,v 1.159 2012/11/04 11:12:31 apb Exp $
+#      $NetBSD: Makefile.kern.inc,v 1.160 2013/07/17 14:05:43 matt Exp $
 #
 # This file contains common `MI' targets and definitions and it is included
 # at the bottom of each `MD' ${MACHINE}/conf/Makefile.${MACHINE}.
@@ -219,7 +219,7 @@
 #      ${SYSTEM_LD} swapxxx.o
 #      ${SYSTEM_LD_TAIL}
 SYSTEM_OBJ?=   ${MD_OBJS} ${MI_OBJS} ${OBJS:O} ${SYSLIBCOMPAT} ${LIBKERN}
-SYSTEM_DEP?=   Makefile ${SYSTEM_OBJ:O} .gdbinit
+SYSTEM_DEP+=   Makefile ${SYSTEM_OBJ:O} .gdbinit
 .if defined(KERNLDSCRIPT)
 SYSTEM_DEP+=   ${KERNLDSCRIPT}
 .endif