puzzling build failures on zani

David Bremner <[email protected]>
Newsgroups gmane.linux.debian.ports.s390
Message-ID <[email protected]> 
I'm having trouble understanding this build failure [1], which seems to
happen only on zani.

pabs mentioned that this is recently upgraded hardware, I'm not sure if
that could be related.

I have a different bug (emacs related) on zelenka [2] that prevents me from
duplicating the problem there.

Any ideas for 
[1]: https://buildd.debian.org/status/fetch.php?pkg=notmuch&arch=s390x&ver=0.29.3-1&stamp=1574860824&raw=0

[2]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931651
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