MarsSeed [1] filed a deletion request for topmenu-gtk3-git [2]: EOL since 2018. [a]
Also broken:
configure: error: in '/build/topmenu-gtk3-git/src/topmenu-gtk':
--with-gtk-srcdir was not specified.
[a]: https://git.javispedro.com/cgit/topmenu-gtk.git
[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/topmenu-gtk3-git/
