I posted a separate topic about this but I want to make sure you see it: I’ve drafted a FHS major revision, licensing store-based Unixes and I’m looking for feedback. Currently it does not cover zoneinfo at all and I’m very open to suggestions on this front. The case where Nix is overlaid on another distribution is also not really covered. And the new language about “store-based” distributions assumes that everything that’s a “static” file goes in the store, and /usr might not even exist; which is abstractly pure but may not be the best practical option in cases like the one you bring up.
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