Dear maintainer,

your package has an autopkgtest regression with CMake 4, caused by
the removal of deprecated backwards compatibility settings.

You can find more information in my debian-devel announcement:
https://lists.debian.org/debian-devel/2025/04/msg00310.html


Hopefully relevant excerpt from
https://ci.debian.net/packages/libz/libzstd/unstable/amd64/64698720/
follows:

 80s autopkgtest [02:28:39]: test build-cmake: [-----------------------
 80s Using /tmp/check-build.ul5d_fha to build cmake
 80s Copying /tmp/autopkgtest-lxc.killrvpo/downtmp/build.R79/src/debian/tests/ztest/cmake to /tmp/check-build.ul5d_fha/cmake
 80s Building cmake in /tmp/check-build.ul5d_fha/cmake
 80s - running `cmake .`
 80s CMake Error at CMakeLists.txt:25 (cmake_minimum_required):
 80s   Compatibility with CMake < 3.5 has been removed from CMake.
 80s
 80s   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
 80s   to tell CMake that the project requires at least <min> but has been updated
 80s   to work with policies introduced by <max> or earlier.
 80s
 80s   Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
 80s
 80s
 80s -- Configuring incomplete, errors occurred!
 80s Could not build the cmake program: A build command failed: could not run `cmake .` in /tmp/check-build.ul5d_fha/cmake: Command '['cmake', '.']'


Cheers
Timo
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We believe that the bug you reported is fixed in the latest version of
libzstd, 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 1116511@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Peter Pentchev <roam@debian.org> (supplier of updated libzstd 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: Sun, 05 Oct 2025 21:28:54 +0300
Source: libzstd
Architecture: source
Version: 1.5.7+dfsg-2
Distribution: unstable
Urgency: medium
Maintainer: RPM packaging team <team+pkg-rpm@tracker.debian.org>
Changed-By: Peter Pentchev <roam@debian.org>
Closes: 1116511
Changes:
 libzstd (1.5.7+dfsg-2) unstable; urgency=medium
 .
   * Fix the autopkgtest with CMake 4.x: declare the minimum policy
     version as 3.10.  Closes: #1116511
   * Declare compliance with Policy 4.7.2 with no changes.
   * Convert the watch file to version 5 of the format.
   * Drop the version from the cmake build dependency.
   * Remove the Salsa CI configuration; more resources needed.
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 ee268825c39a88dd94091cb16c1b0103660f536a 23020 libzstd_1.5.7+dfsg-2.debian.tar.xz
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Checksums-Sha256:
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Files:
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