berserkingyadis [1] filed a deletion request for hakuneko [2]:

this project has been abandoned by the creator

src: https://sourceforge.net/projects/legacy.hakuneko.p/files/

there is a "new" hakuneko, which already has a package https://aur.archlinux.org/packages/hakuneko-desktop

[1] https://aur.archlinux.org/account/berserkingyadis/ [2] https://aur.archlinux.org/pkgbase/hakuneko/