Bug#1136311: opengv: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

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Package: src:opengv
Version: 1.0+1git91f4b1-9
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

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

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3759478/

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

- -- Detecting CXX compile features - done
- -- Eigen version .. found in /usr/include/eigen3, but at least version 2.91.0 is required
CMake Error at /usr/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:290 (message):
  Could NOT find Eigen (missing: EIGEN_VERSION_OK) (Required is at least
  version "2.91.0")
Call Stack (most recent call first):
  /usr/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:654 (_FPHSA_FAILURE_MESSAGE)
  modules/FindEigen.cmake:76 (find_package_handle_standard_args)
  CMakeLists.txt:49 (find_package)


- -- Configuring incomplete, errors occurred!
	cd .pybuild/cpython3_3.14/build && tail -v -n \+0 CMakeCache.txt
==> CMakeCache.txt <==
# This is the CMakeCache file.
# For build in directory: /build/reproducible-path/opengv-1.0+1git91f4b1/.pybuild/cpython3_3.14/build
# 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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