I currently maintain lib32-allegro  in its version 5.0. However, I
wanted to change its version to 4 (anything less than version5) and
add a lib32-allegro5 (anything >=5). The idea is to follow packages
allegro  and allegro5 .
I found a variable "epoch", which if not set in PKGBUILD is equal
0. I could set "epoch=1" to force downgrade to lib32-allegro during
the system update and upload to AUR lib32-allegro5 for who wants it.
What do you think about this procedure? Any other suggestions?