Possibly a help2man <https://bugs.debian.org/787444> version below 1.47.1 is used on the build server and help2man doesn't support SOURCE_DATE_EPOCH before this date. (See: https://wiki.debian.org/ReproducibleBuilds/TimestampsProposal). I'm not familiar with the debian automated build infrastructure, and I will have to ask some newsgroups how to examine the build toolchain.

Roelof

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