Ok so I've changed the pkgver to the last beta, as that seems to work on my end for now. Usually I wouldn't do that but as a workaround for the rust version incompatibility this seems to me like the best solution in this case.

Thanks for the heads up @kaneki. I hadn't tried to rebuild this after latest rust update but sure enough it fails with the time package related error.

I'm in two minds about whether it's worth me pulling the referenced commit as a patch over latest tagged version https://github.com/ankitects/anki/commit/dca962c81ecc8ba98e81d06c169bffae0c77794d or if we should just wait for a stable point release (there have been several beta releases, p'raps I could exceptionally upgrade the pkgver to one of them...)