[Debian-astro-maintainers] Bug#1136331: sopt: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

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Package: src:sopt
Version: 5.0.1+dfsg-1
Severity: important
Tags: sid forky ftbfs
User: debian-devel at lists.debian.org
Usertags: eigen3-5.0

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

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

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3761812/

Here is the most probably relevant part of the failing build log:
    ===========================================
common_mpi_catch_main.cc.o -c /build/reproducible-path/sopt-5.0.1+dfsg/cpp/tests/common_mpi_catch_main.cc
In file included from /build/reproducible-path/sopt-5.0.1+dfsg/cpp/sopt/../sopt/wavelets/wavelets.h:5,
                 from /build/reproducible-path/sopt-5.0.1+dfsg/cpp/sopt/wavelets/wavelets.cc:1:
/build/reproducible-path/sopt-5.0.1+dfsg/cpp/sopt/../sopt/types.h:7:10: fatal error: Eigen/Core: No such file or directory
    7 | #include <Eigen/Core>
      |          ^~~~~~~~~~~~
compilation terminated.
make[3]: *** [cpp/sopt/CMakeFiles/sopt.dir/build.make:96: cpp/sopt/CMakeFiles/sopt.dir/wavelets/wavelets.cc.o] Error 1
make[3]: *** Waiting for unfinished jobs....

    ===========================================
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
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