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SOURCE_DATE_EPOCH is not a Nix thing

https://reproducible-builds.org/docs/source-date-epoch/

(although Nix sets it as a default)

Nix hashes the build inputs, for which deterministic builds are not required, only desirable.

Yes, reading this I was thinking about how many of these problems go away with a nix environment. Certainly not all of them, but it’s a great way to get a reproducible build environment that includes direct specification of system dependencies.