Dear Maintainer,

your package depends on libeigen3-dev. The upstream released a
new major version of this mathematical library, 5.0.0. Some
basic information about new features and changes in this version
can be found here:

https://libeigen.gitlab.io/releases/5.0/

This is a major version change and may require code changes in packages
depending on eigen3. The key breaking changes include:

  - Minimum required C++ standard is now C++14
  - Changes in the build system integration
  - Some API name changes

leela-zero FTBFS with libeigen3-dev 5.0.1. The full build log is available at:

https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3757105/

Here is the most probably relevant part of the failing build log:
    ===========================================

Dear maintainers,

eigen3 5.0 (libeigen3-dev 5.0) is now in unstable, so these FTBFS bugs are
release-critical.  I am therefore raising their severity to serious.

Regards,

Anton

Dear maintainer,

I've prepared an NMU for leela-zero (versioned as 0.17-1.4) and uploaded
it to DELAYED/2. Please feel free to tell me if I should cancel it.

cu
Adrian

We believe that the bug you reported is fixed in the latest version of
leela-zero, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1136246@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Adrian Bunk <bunk@debian.org> (supplier of updated leela-zero package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 17 Oct 2026 20:49:38 +0300
Source: leela-zero
Architecture: source
Version: 0.17-1.4
Distribution: unstable
Urgency: medium
Maintainer: Ximin Luo <infinity0@debian.org>
Changed-By: Adrian Bunk <bunk@debian.org>
Closes: 1136246
Changes:
 leela-zero (0.17-1.4) unstable; urgency=medium
 .
   * Non-maintainer upload.
   * Fix FTBFS with Eigen 5. (Closes: #1136246)
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 3de7bcfe38864a6035f379fbd88bd5d3e1f2f8f0 7420 leela-zero_0.17-1.4.debian.tar.xz
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