Index: head/lib/libc/tests/gen/posix_spawn/Makefile
===================================================================
--- head/lib/libc/tests/gen/posix_spawn/Makefile
+++ head/lib/libc/tests/gen/posix_spawn/Makefile
@@ -19,8 +19,12 @@
 
 .include "../../Makefile.netbsd-tests"
 
+# The dd status=none option is non-standard. Only use it when this test succeeds
+# rather than require dd to be a bootstrap tool.
+DD_NOSTATUS!=(dd status=none count=0 2> /dev/null && echo status=none) || true
+DD=dd ${DD_NOSTATUS}
 h_zero:
-	dd if=/dev/zero of=h_zero bs=1k count=2 status=none
+	${DD} if=/dev/zero of=h_zero bs=1k count=2
 	chmod a+x h_zero
 
 CLEANFILES+=	h_zero
Index: head/lib/libc/tests/sys/Makefile
===================================================================
--- head/lib/libc/tests/sys/Makefile
+++ head/lib/libc/tests/sys/Makefile
@@ -96,7 +96,11 @@
 truncate_test_FILESPACKAGE=	${PACKAGE}
 
 CLEANFILES=	truncate_test.root_owned
+# The dd status=none option is non-standard. Only use it when this test succeeds
+# rather than require dd to be a bootstrap tool.
+DD_NOSTATUS!=(dd status=none count=0 2> /dev/null && echo status=none) || true
+DD=dd ${DD_NOSTATUS}
 truncate_test.root_owned:
-	dd if=/dev/null bs=1 count=1 of=${.TARGET} status=none
+	${DD} if=/dev/null bs=1 count=1 of=${.TARGET}
 
 .include <bsd.test.mk>