no knotd_stdio generated when compiled with afl

I compile knot-dns according to https://gitlab.labs.nic.cz/knot/knot-dns/wikis/Fuzzing, but when I execute "make check" in step3, there are no "knotd_stdio" command in anywhere. I wonder if there are something wrong with my operation.

The environment is kali2 amd64 and I have installed all requirements and latest afl. The afl version is 2.51b and clang version is 4.0.