Zrax [1] filed a orphan request for libkqueue [2]:

libkqueue has been marked out of date for 2.5 months.  The posted
version does not build any more, and there have been three messages in
the comments regarding the out of date package.

[1] https://aur.archlinux.org/account/Zrax/
[2] https://aur.archlinux.org/pkgbase/libkqueue/