[Debian-med-packaging] Bug#1136250: mrtrix3: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Package: src:mrtrix3
Version: 3.0.8-1
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

mrtrix3 FTBFS with libeigen3-dev 5.0.1. The full build log is available at:

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3758084/

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

Checking for Eigen3 library: 
ERROR: error compiling Eigen3 application!

    MRtrix3 was unable to compile a test program involving Eigen3.

  Set the EIGEN_CFLAGS environment variable to inform 'configure' of
  the flags it must provide to the compiler in order to compile
  programs that use Eigen3 functionality; this may include the path to
  the Eigen3 include files, as well as any required flags.
  For example:
    $ export EIGEN_CFLAGS="-isystem /usr/include/eigen3"
    $./configure
  (amend with the actual path to the Eigen3 include files on your system)

make[1]: *** [debian/rules:36: override_dh_auto_configure] Error 1
make[1]: Leaving directory '/build/reproducible-path/mrtrix3-3.0.8'
make: *** [debian/rules:33: binary-arch] Error 2
dpkg-buildpackage: error: debian/rules binary-arch subprocess failed with exit status 2

    ===========================================
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
-----BEGIN PGP SIGNATURE-----
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=K/a5
-----END PGP SIGNATURE-----