Strangely, the dummy package built fine (i.e. only reproducibility problems, not build-chain problems) on a Mint 19.3-based machine, which allowed me to try out Vagrant's suggestions[1]:
> This *should* vary only time: > reprotest --variations=-all,+time > and and only timezome: > reprotest --variations=-all,+timezone reprotest --variations=-all,+time . built fine. But reprotest --variations=-all,+timezone . did not: -CreationDate: Mon Dec 31 00:00:00 2018 GMT -ModDate: Mon Dec 31 00:00:00 2018 GMT +CreationDate: Tue Jan 1 02:00:00 2019 GMT +ModDate: Tue Jan 1 02:00:00 2019 GMT But given that Chris couldn't reproduce the problem outside reprotest, my suggestion would be for someone with knowledge of the internals of reprotest to take a look and understand what is going on. [1] https://alioth-lists.debian.net/pipermail/reproducible-builds/Week-of-Mon-20200203/012103.html
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