As can be seen in the build logs at https://buildd.debian.org/status/fetch.php?pkg=bind9&arch=amd64&ver=1%3A9.16.4-1&stamp=1592427938&raw=0:
Unrecognized options:
--disable-silent-rules, --disable-dependency-tracking, --enable-threads, --with-gost, --with-libjson-c, --with-atf, --enable-ipv6, --enable-rrl, --enable-filter-aaaa--with-libjson-c is not recogznied anymore. We should be using --with-json-c nowadays:
--with-libjson deprecated, use --with-json-c
--with-json-c build with json-c library [yes|no|detect] (default
is detect)