Dear maintainer,

During a test rebuild for CMake 4, libvncserver failed to rebuild.

Log Summary:
-------------------------------------------------------------------------------
[...]
 e3d6050fb1a0161a851fcc5081a4deeb87ff452f 18056 libvncserver_0.9.15+dfsg-1.debian.tar.xz
Checksums-Sha256:
 522faacc783ca0924d34e2a355c3b1cc2d17115e04ffb78e7935db541af184d0 446056 libvncserver_0.9.15+dfsg.orig.tar.xz
 df05aa1f28da634ca4ffe8cb97c1858ebdd1122a882b04165e3e64b98896ee9c 18056 libvncserver_0.9.15+dfsg-1.debian.tar.xz
Files:
 b650ea182f01cbf464d9152b0939e738 446056 libvncserver_0.9.15+dfsg.orig.tar.xz
 8c29216994c0ce4194a74075d4b0aefb 18056 libvncserver_0.9.15+dfsg-1.debian.tar.xz
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dpkg-source: warning: cannot verify inline signature for ./libvncserver_0.9.15+dfsg-1.dsc: no acceptable signature found
dpkg-source: info: extracting libvncserver in /build/reproducible-path/libvncserver-0.9.15+dfsg
dpkg-source: info: unpacking libvncserver_0.9.15+dfsg.orig.tar.xz
dpkg-source: info: unpacking libvncserver_0.9.15+dfsg-1.debian.tar.xz

Check disk space
----------------

Sufficient free space for build

User Environment
----------------

APT_CONFIG=/var/lib/sbuild/apt.conf
HOME=/sbuild-nonexistent
LANG=C.UTF-8
LC_ALL=C.UTF-8
LOGNAME=sbuild
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
SHELL=/bin/sh
USER=sbuild

dpkg-buildpackage
-----------------

Command: dpkg-buildpackage --sanitize-env -us -uc -b
dpkg-buildpackage: info: source package libvncserver
dpkg-buildpackage: info: source version 0.9.15+dfsg-1
dpkg-buildpackage: info: source distribution unstable
dpkg-buildpackage: info: source changed by Mike Gabriel <sunweaver@debian.org>
 dpkg-source --before-build .
dpkg-buildpackage: info: host architecture arm64
 debian/rules clean
dh clean
   debian/rules override_dh_auto_clean
make[1]: Entering directory '/build/reproducible-path/libvncserver-0.9.15+dfsg'
dh_auto_clean
rm -f rfb/rfbconfig.h
make[1]: Leaving directory '/build/reproducible-path/libvncserver-0.9.15+dfsg'
   dh_clean
 debian/rules binary
dh binary
   dh_update_autotools_config
   dh_autoreconf
   debian/rules override_dh_auto_configure
make[1]: Entering directory '/build/reproducible-path/libvncserver-0.9.15+dfsg'
dh_auto_configure -- \
    -DWITH_PNG=OFF \
    -DCMAKE_BUILD_TYPE=RELWITHDEBINFO \

	cd obj-aarch64-linux-gnu && DEB_PYTHON_INSTALL_LAYOUT=deb PKG_CONFIG=/usr/bin/pkg-config cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=None -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LOCALSTATEDIR=/var -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_FIND_USE_PACKAGE_REGISTRY=OFF -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON -DFETCHCONTENT_FULLY_DISCONNECTED=ON -DCMAKE_INSTALL_RUNSTATEDIR=/run -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=ON "-GUnix Makefiles" -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_LIBDIR=lib/aarch64-linux-gnu -DWITH_PNG=OFF -DCMAKE_BUILD_TYPE=RELWITHDEBINFO ..
CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

-------------------------------------------------------------------------------

The above is just how the build ends and not necessarily the most relevant part.
If required, the full build log is available here (for the next 30 days):
https://debusine.debian.net/artifact/2402729/

The most likely cause of build failures is the removed backwards compatibility for
CMake versions earlier than 3.5. You can find additional information in my
debian-devel announcement:

https://lists.debian.org/debian-devel/2025/04/msg00310.html

About the archive rebuild: The build was made on debusine.debian.net,
using sbuild.

You can find the build task here:
https://debusine.debian.net/work-request/153929/

If this is really a bug in one of the build-depends, please use
reassign and affects, so that this is still visible in the BTS web
page for this package.

Thanks,
Timo

I have downgraded the bug to non-RC severity temporarily and reverted
CMake in unstable to version 3.31.6. I plan to re-upgrade in about a
month's time. I realize that despite my April announcement, the upload
to unstable came rather surprising, and I don't want to cause
unnecessary pain.

Also, the build log URL has an unfortunate mistake. The correct URL
should include the workspace, i.e.,

https://debusine.debian.net/debian/developers/artifact/XXXX

CMake 4 will also be available in experimental again, so it can be
used to verify that the bug is fixed.

Cheers
Timo