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

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

https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3755228/

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

We believe that the bug you reported is fixed in the latest version of
dart, 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 1136231@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Maximiliano Curia <maxy@debian.org> (supplier of updated dart 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, 08 Oct 2026 16:59:04 +0200
Source: dart
Architecture: source
Version: 6.13.2+ds-4
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Maximiliano Curia <maxy@debian.org>
Closes: 1133453 1136231
Changes:
 dart (6.13.2+ds-4) unstable; urgency=medium
 .
   * Team upload.
   * Backport upstream patches to fix FTBFS with GCC-16 (Closes: #1133453):
     - Update required C++ standard to C++20 (#2068).
     - Add patch to silence obsolete <ciso646> warning from octomap.
   * Backport upstream patches to fix FTBFS with Eigen 5 (Closes: #1136231):
     - Change how version requirement for Eigen3 package is enforced (#2107).
     - Include <cassert> before FCL headers (#3021).
     - Migrate to the Eigen 5 JacobiSVD API (#2765).
   * Backport upstream patches:
     - Fix spdlog/fmt runtime logging (DART 6.16) (#2540).
     - Handle ODE libccd box-cylinder contacts (#2389).
     - Backport ARM64 joint copy and Icosphere fixes.
   * debian/rules:
     - Use guess_concurrency (4G per worker) for tests across all arches.
     - Clean up empty screencap directory and extra license file.
   * debian/tests:
     - Force tests to use C++17.
     - Depend on pkgconf instead of obsolete pkg-config.
   * debian/control:
     - Update Standards-Version to 4.7.4.
     - Build-Depend on guess-concurrency.
     - Drop redundant Priority: optional from Source.
   * debian/patches/fix-test_ForceDependentSlip-armel.patch:
     - Fix spelling error in patch description.
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