Source: pacman-package-manager Version: 6.0.2-4.1 Severity: grave Pacman currently fails to build on armel/armhf, probably as a fallout from the time64 changes.
Given it seems extremely unlikely to be needed on those architectures, given Archlinux doesn't even support them, I'd recommend to simply build-depend on architecture-is-64-bit to drop all 32 bit arches support, and revert the libalpm13 package rename that added the t64 suffix.