It seems to be relying on an outdated version, that is no longer available in either the repos or the AUR.
You could try changing this line
boost-libs=1.74.0
to this
boost174-libs
No workaround for boost-libs=1.74 in near sight, though?Not to my knowledge. They’ve linked to version 1.74 because that’s what’s available on Debian Bullseye. I don’t think it’s possible patch the executable to use 1.81 so’s, but I’d be happy to do so if there was a way. Debian Experimental has 1.81 but I guess that’s years away.
The only think I can think of would be to reach out to them and ask them to not link explicitly to version 1.74, or to statically link Boost.
EDIT:
Corrected.
The package maintainer should be notified so they can correct the PKGBUILD.