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To: maintonly@bugs.debian.org
From: Anton Gladky &lt;gladk@debian.org&gt;
Subject: pagmo: FTBFS with libeigen3-dev 5.0 (major version transition)
Message-Id: &lt;20260511203434.F0B93BE60AF@MacBook-Air-von-Anton.local&gt;
Date: Mon, 11 May 2026 22:34:34 +0200 (CEST)
Delivered-To: maintonly@bugs.debian.org

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Package: src:pagmo
Version: 2.19.1-1
Severity: important
Tags: sid forky ftbfs
User: debian-devel@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

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

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3759834/

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

- -- Looking for pthread_atfork - found
- -- Library installation directory: /usr/lib/x86_64-linux-gnu
- -- TBB found using config mode.
CMake Error at CMakeLists.txt:166 (find_package):
  Could not find a configuration file for package &quot;Eigen3&quot; that is compatible
  with requested version &quot;3.3&quot;.

  The following configuration files were considered but not accepted:

    /usr/share/eigen3/cmake/Eigen3Config.cmake, version: 5.0.1
      The version found is not compatible with the version requested.



- -- Configuring incomplete, errors occurred!
	cd config_shared &amp;&amp; tail -v -n \+0 CMakeCache.txt
==&gt; CMakeCache.txt &lt;==
# This is the CMakeCache file.
# For build in directory: /build/reproducible-path/pagmo-2.19.1/config_shared
# It was generated by CMake: /usr/bin/cmake
# You can edit this file to change values found and used by cmake.
# If you do not want to change any of the values, simply exit the editor.
# If you do want to change a value, simply edit, save, and exit the editor.
# The syntax for the file is as follows:
# KEY:TYPE=VALUE
# KEY is the name of a variable in the cache.
# TYPE is a hint to GUIs for the type of VALUE, DO NOT EDIT TYPE!.
# VALUE is the current value for the KEY.

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