use ${.CURDIR:H:H} instead of ../.. for default setting of SYSDIR,

because the latter doesn't work with objdirs

sys/kern/Make.tags.inc

@@ -1,4 +1,4 @@
-#	$NetBSD: Make.tags.inc,v 1.9 2001/04/03 16:56:16 jhawk Exp $
+#	$NetBSD: Make.tags.inc,v 1.10 2001/04/18 11:21:24 lukem Exp $
 #
 #	from: @(#)Make.tags.inc	8.1 (Berkeley) 6/11/93
 
@@ -14,7 +14,7 @@
 # the arch directories. Traditionally, COMM would have been an explicit list.
 # This promises to be easier to maintain, considering how often the directory
 # structure of the kernel sources has been changing recently.
-SYSDIR?= ../..
+SYSDIR?= ${.CURDIR:H:H}
 COMM!=	find -H ${SYSDIR} -name arch -prune -o -name "*.[ch]" -print | \
 		sed 's@\(.*/\).*\..*@\1*.\[ch\]@' | sort -t / -u
 .endif