Index: head/sys/dts/Makefile.inc
===================================================================
--- head/sys/dts/Makefile.inc	(revision 325838)
+++ head/sys/dts/Makefile.inc	(revision 325839)
@@ -1,10 +1,10 @@
 # $FreeBSD$
 
-SYSDIR?=${.CURDIR}/../../../..
+SYSDIR?=${SRCTOP}/sys
 
 test-dts:
 .for dts in ${DTS}
 	@env MACHINE=`basename ${.CURDIR}` ${SYSDIR}/tools/fdt/make_dtb.sh ${SYSDIR} ${dts} /tmp
 
 .endfor