griffin [1] filed a orphan request for joplin [2]:
I've been updating the package based on his git repo for many versions
and have had no responses after answering his build question.
https://github.com/masterkorp/joplin-pkgbuild
I have made my own fork of the project seen here
https://github.com/WingofaGriffin/joplin-pkgbuild that builds properly
and is up to date.
[1] https://aur.archlinux.org/account/griffin/
[2] https://aur.archlinux.org/pkgbase/joplin/