FreeBSD 13.1-RELEASE $< and $^

[Kaíque Kandy Koga]

$< and $^ do not seem to work on FreeBSD.

[kandy@ ~/a]$ cat Makefile
a: aaaa
        echo "0:"
        echo $@
        echo "1:"
        echo $<
        echo "2:"
        echo $^

aaaa:

.SILENT : a aaaa
.PHONY : a aaaa

[kandy@ ~/a]$ make
0:
a
1:

2: