Index: head/usr.bin/dtc/Makefile
===================================================================
--- head/usr.bin/dtc/Makefile	(revision 328640)
+++ head/usr.bin/dtc/Makefile	(revision 328641)
@@ -1,11 +1,13 @@
 # $FreeBSD$
 
 PROG_CXX=dtc
 SRCS=	dtc.cc input_buffer.cc string.cc dtb.cc fdt.cc checking.cc
 MAN=	dtc.1
 
+WARNS?=	3
+
 CXXFLAGS+=	-std=c++11 -fno-rtti -fno-exceptions
 
 NO_SHARED?=NO
 
 .include <bsd.prog.mk>