If working with the AUR,
you can alter the PKGBUILD and other build files on your own behalf.
To either fix what's wrong,
or to roll back to a previous version of the package.
I've did both a few times already,
however I'm on Manjaro.
Pamac, their graphical installer,
prompts me if I'd like to edit the build files before starting the build/install process, unsure how to do it in Arch, but the ArchWiki should be able to tell you.
Also, if you'd fix what's wrong,
please post your diff on the AUR package thread, that can save the maintainer some work / help with rolling an updated package out to the other users faster.