Index: share/man/man5/make.conf.5
===================================================================
--- share/man/man5/make.conf.5
+++ share/man/man5/make.conf.5
@@ -176,6 +176,11 @@
 .Dq Li +=
 instead of
 .Dq Li = .
+.It Va DTC
+.Pq Vt str
+Select the compiler for DTS (Device Tree Syntax) file.
+.Va DTC
+is initially set to the value of /usr/bin/dtc
 .It Va INSTALL
 .Pq Vt str
 the default install command.
Index: sys/conf/kmod.mk
===================================================================
--- sys/conf/kmod.mk
+++ sys/conf/kmod.mk
@@ -64,6 +64,7 @@
 #
 
 AWK?=		awk
+DTC?=		/usr/bin/dtc
 KMODLOAD?=	/sbin/kldload
 KMODUNLOAD?=	/sbin/kldunload
 KMODISLOADED?=	/sbin/kldstat -q -n
Index: sys/tools/fdt/make_dtb.sh
===================================================================
--- sys/tools/fdt/make_dtb.sh
+++ sys/tools/fdt/make_dtb.sh
@@ -20,5 +20,5 @@
     dtb=${dtb_path}/`basename $d .dts`.dtb
     echo "converting $d -> $dtb"
     cpp -P -x assembler-with-cpp -I $S/gnu/dts/include -I $S/boot/fdt/dts/${MACHINE} -I $S/gnu/dts/${MACHINE} -include $d /dev/null | 
-	dtc -O dtb -o $dtb -b 0 -p 1024 -i $S/boot/fdt/dts/${MACHINE} -i $S/gnu/dts/${MACHINE}
+	${DTC} -O dtb -o $dtb -b 0 -p 1024 -i $S/boot/fdt/dts/${MACHINE} -i $S/gnu/dts/${MACHINE}
 done