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:
>
>