Bug#805787: deja-dup: please make the build reproducible

[Reiner Herrmann]

Source: deja-dup
Version: 34.0-1
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that deja-dup could not be built reproducibly.
It ships an embedded and outdated copy of help2man, which doesn't
support SOURCE_DATE_EPOCH yet. This leads to the current build date
getting embedded into the manpages.

The attached patch fixes this by adding a build dependency for help2man
and using it instead of the included version.

Regards,
 Reiner

[1]: https://wiki.debian.org/ReproducibleBuilds

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