Change PKGBUILD, here line 10
arch=("i686" "x86_64")
for all = any
arch=("any")
or add aarch64
arch=("i686" "x86_64" "aarch64")
save file and re-compile
https://wiki.archlinux.org/title/PKGBUILD
** at second glance … no aarch64 source ?! from dropbox 