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To: maintonly@bugs.debian.org
From: Anton Gladky &lt;gladk@debian.org&gt;
Subject: promod3: FTBFS with libeigen3-dev 5.0 (major version transition)
Message-Id: &lt;20260511203726.EC2E7BE6466@MacBook-Air-von-Anton.local&gt;
Date: Mon, 11 May 2026 22:37:26 +0200 (CEST)
Delivered-To: maintonly@bugs.debian.org

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

Package: src:promod3
Version: 3.6.0+ds-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

promod3 FTBFS with libeigen3-dev 5.0.1. The full build log is available at:

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3760885/

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

- -- Check size of void*
- -- Check size of void* - done
- -- Found Python: /usr/bin/python3 (found suitable version &quot;3.13.12&quot;, minimum required is &quot;3.6&quot;) found components: Interpreter Development Development.Module Development.Embed
- -- Eigen3 version .. found in /usr/include/eigen3, but at least version 3.3.0 is required
CMake Error at /usr/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:290 (message):
  Could NOT find Eigen3 (missing: EIGEN3_VERSION_OK) (Required is at least
  version &quot;3.3.0&quot;)
Call Stack (most recent call first):
  /usr/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:654 (_FPHSA_FAILURE_MESSAGE)
  cmake_support/FindEigen3.cmake:77 (find_package_handle_standard_args)
  CMakeLists.txt:146 (find_package)


- -- Configuring incomplete, errors occurred!
	cd obj-x86_64-linux-gnu &amp;&amp; tail -v -n \+0 CMakeCache.txt
==&gt; CMakeCache.txt &lt;==

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