a821 [1] filed a deletion request for hnb [2]: Abandoned package. Upstream released the last version in 2003. It fails to build since 2016 (looking at the comments) which I could confirm. Nothing depends on it. I suggest deletion.
[1] https://aur.archlinux.org/account/a821/ [2] https://aur.archlinux.org/pkgbase/hnb/
