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

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

https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3759200/

Here is the most probably relevant part of the failing build log:
    ===========================================
g++ -o src/common/nanopolish_variant.o -c -g -O2 -ffile-prefix-map=/build/reproducible-path/nanopolish-0.14.0=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -O3 -flto -std=c++11 -fopenmp -fsigned-char -D_FILE_OFFSET_BITS=64  -Wdate-time -D_FORTIFY_SOURCE=2 -I/usr/include/hdf5/serial -I/usr/include/eigen3 -I/usr/include/minimap2   -I/usr/include/minimap2 -I./src -I./src/hmm -I./src/thirdparty -I./src/thirdparty/scrappie -I./src/common -I./src/alignment -I./src/pore_model -I./src/io -I./src/basemods   -fPIC src/common/nanopolish_variant.cpp
In file included from /usr/include/eigen3/Eigen/Core:22,
                 from /usr/include/eigen3/Eigen/Dense:1,
                 from src/nanopolish_methyltrain.cpp:48:
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:749:2: error: #error Eigen requires at least c++14 support.
  749 | #error Eigen requires at least c++14 support.
      |  ^~~~~

    ===========================================
libeigen3-dev_5.0.1-1 is available in experimental.

When this package version lands into unstable (probably at the beginning
of June 2026), this bug will be increased in severity to serious.

Thanks,

Anton

Hello,

Bug #1136251 in nanopolish reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below and you can check the diff of the fix at:

https://salsa.debian.org/med-team/nanopolish/-/commit/e4f90e7e0a43166f6eab49d959647a02366a92ea
------------------------------------------------------------------------
libeigen 5.0 requires minimum -std=c++14 Closes: #1136251
------------------------------------------------------------------------

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/1136251

We believe that the bug you reported is fixed in the latest version of
nanopolish, 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 1136251@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andreas Tille <tille@debian.org> (supplier of updated nanopolish 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: Thu, 11 Jun 2026 21:17:19 +0200
Source: nanopolish
Architecture: source
Version: 0.14.0-3
Distribution: unstable
Urgency: medium
Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.org>
Changed-By: Andreas Tille <tille@debian.org>
Closes: 1136251
Changes:
 nanopolish (0.14.0-3) unstable; urgency=medium
 .
   * d/watch: version=5
   * libeigen 5.0 requires minimum -std=c++14
     Closes: #1136251
   * Standards-Version: 4.7.4 (routine-update)
   * Reflow Uploaders field (cme)
   * Remove Priority field (cme)
   * Build-Depends: s/dh-python/dh-sequence-python3/ (routine-update)
   * Drop 'Rules-Requires-Root: no' from d/control (routine-update)
   * Reformat the Last-Update date as ISO YYYY-MM-DD.
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