Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.

The full build log is available from:
http://qa-logs.debian.net/2025/09/19/xeus-zmq_3.1.0-0.3_unstable.log

All bugs filed during this archive rebuild are listed at:
https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=ftbfs-20250919;users=lucas@debian.org
or:
https://udd.debian.org/bugs/?release=na&merged=ign&fnewerval=7&flastmodval=7&fusertag=only&fusertagtag=ftbfs-20250919&fusertaguser=lucas@debian.org&allbugs=1&cseverity=1&ctags=1&caffected=1#results

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

If you reassign this bug to another package, please mark it as 'affects'-ing
this package. See https://www.debian.org/Bugs/server-control#affects

If you fail to reproduce this, please provide a build log and diff it with mine
so that we can identify if something relevant changed in the meantime.

reassign 1115812 nlohmann-json3-dev
quit

This is #1110787.

I did NMU nlohmann-json3-dev to fix all those bug but the Debian maintainer has
reintroduced them immediately afterward...

Cheers,
Bill