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

iqtree3 FTBFS with libeigen3-dev 5.0.1. The full build log is available at:

https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3756398/

Here is the most probably relevant part of the failing build log:
    ===========================================
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:93 (message):
  Eigen3 library not found.  Either install it or rerun cmake with
  -DEIGEN3_INCLUDE_DIR=<installed_eigen3_dir>

Hello,

Bug #1136241 in iqtree reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below and you can check the diff of the fix at:

https://salsa.debian.org/med-team/iqtree/-/commit/8e7db3fae134a26fb49ac3a3af1a96fb40edfb19

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/1136241

We believe that the bug you reported is fixed in the latest version of
iqtree, 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 1136241@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andreas Tille <tille@debian.org> (supplier of updated iqtree 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: Tue, 09 Jun 2026 16:22:21 +0200
Source: iqtree
Architecture: source
Version: 2.4.0+dfsg-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.org>
Changed-By: Andreas Tille <tille@debian.org>
Closes: 1136241
Changes:
 iqtree (2.4.0+dfsg-2) unstable; urgency=medium
 .
   * d/watch: Use auto for Dversion-Mangle
   * Build using Libeigen 5.0
     Closes: #1136241
   * Remove redundant Priority: optional from source stanza.
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We believe that the bug you reported is fixed in the latest version of
iqtree3, 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 1136241@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andreas Tille <tille@debian.org> (supplier of updated iqtree3 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: Tue, 09 Jun 2026 22:21:38 +0200
Source: iqtree3
Architecture: source
Version: 3.1.1+dfsg-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.org>
Changed-By: Andreas Tille <tille@debian.org>
Closes: 1136241
Changes:
 iqtree3 (3.1.1+dfsg-2) unstable; urgency=medium
 .
   * Build using Libeigen 5.0
     Closes: #1136241
   * d/watch: Use auto for Dversion-Mangle
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