Bug#1113220: libvncserver: FTBFS with CMake 4
Source: libvncserver
Version: 0.9.15+dfsg-1
Severity: serious
User: cmake@packages.debian.org
Usertags: cmake-4
Tags: ftbfs, forky, sid
Dear maintainer,
During a test rebuild for CMake 4, libvncserver failed to rebuild.
Log Summary:
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[...]
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.
-- Configuring incomplete, errors occurred!
cd obj-aarch64-linux-gnu && tail -v -n \+0 CMakeCache.txt
==> CMakeCache.txt <==
# This is the CMakeCache file.
# For build in directory: /build/reproducible-path/libvncserver-0.9.15+dfsg/obj-aarch64-linux-gnu
# 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.
########################
# EXTERNAL cache entries
########################
//No help, variable specified on the command line.
CMAKE_BUILD_TYPE:UNINITIALIZED=RELWITHDEBINFO
//No help, variable specified on the command line.
CMAKE_EXPORT_NO_PACKAGE_REGISTRY:UNINITIALIZED=ON
//No help, variable specified on the command line.
CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY:UNINITIALIZED=ON
//Value Computed by CMake.
CMAKE_FIND_PACKAGE_REDIRECTS_DIR:STATIC=/build/reproducible-path/libvncserver-0.9.15+dfsg/obj-aarch64-linux-gnu/CMakeFiles/pkgRedirects
//No help, variable specified on the command line.
CMAKE_FIND_USE_PACKAGE_REGISTRY:UNINITIALIZED=OFF
//No help, variable specified on the command line.
CMAKE_INSTALL_LIBDIR:UNINITIALIZED=lib/aarch64-linux-gnu
//No help, variable specified on the command line.
CMAKE_INSTALL_LOCALSTATEDIR:UNINITIALIZED=/var
//No help, variable specified on the command line.
CMAKE_INSTALL_PREFIX:UNINITIALIZED=/usr
//No help, variable specified on the command line.
CMAKE_INSTALL_RUNSTATEDIR:UNINITIALIZED=/run
//No help, variable specified on the command line.
CMAKE_INSTALL_SYSCONFDIR:UNINITIALIZED=/etc
//No help, variable specified on the command line.
CMAKE_SKIP_INSTALL_ALL_DEPENDENCY:UNINITIALIZED=ON
//No help, variable specified on the command line.
CMAKE_VERBOSE_MAKEFILE:UNINITIALIZED=ON
//No help, variable specified on the command line.
FETCHCONTENT_FULLY_DISCONNECTED:UNINITIALIZED=ON
//No help, variable specified on the command line.
WITH_PNG:UNINITIALIZED=OFF
########################
# INTERNAL cache entries
########################
//This is the directory where this CMakeCache.txt was created
CMAKE_CACHEFILE_DIR:INTERNAL=/build/reproducible-path/libvncserver-0.9.15+dfsg/obj-aarch64-linux-gnu
//Major version of cmake used to create the current loaded cache
CMAKE_CACHE_MAJOR_VERSION:INTERNAL=4
//Minor version of cmake used to create the current loaded cache
CMAKE_CACHE_MINOR_VERSION:INTERNAL=1
//Patch version of cmake used to create the current loaded cache
CMAKE_CACHE_PATCH_VERSION:INTERNAL=1
//Path to CMake executable.
CMAKE_COMMAND:INTERNAL=/usr/bin/cmake
//Path to cpack program executable.
CMAKE_CPACK_COMMAND:INTERNAL=/usr/bin/cpack
//Path to ctest program executable.
CMAKE_CTEST_COMMAND:INTERNAL=/usr/bin/ctest
//Name of external makefile project generator.
CMAKE_EXTRA_GENERATOR:INTERNAL=
//Name of generator.
CMAKE_GENERATOR:INTERNAL=Unix Makefiles
//Generator instance identifier.
CMAKE_GENERATOR_INSTANCE:INTERNAL=
//Name of generator platform.
CMAKE_GENERATOR_PLATFORM:INTERNAL=
//Name of generator toolset.
CMAKE_GENERATOR_TOOLSET:INTERNAL=
//Source directory with the top level CMakeLists.txt file for this
// project
CMAKE_HOME_DIRECTORY:INTERNAL=/build/reproducible-path/libvncserver-0.9.15+dfsg
//Name of CMakeLists files to read
CMAKE_LIST_FILE_NAME:INTERNAL=CMakeLists.txt
//number of local generators
CMAKE_NUMBER_OF_MAKEFILES:INTERNAL=1
//Path to CMake installation.
CMAKE_ROOT:INTERNAL=/usr/share/cmake-4.1
dh_auto_configure: error: 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 .. returned exit code 1
make[1]: *** [debian/rules:21: override_dh_auto_configure] Error 2
make[1]: Leaving directory '/build/reproducible-path/libvncserver-0.9.15+dfsg'
make: *** [debian/rules:14: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
--------------------------------------------------------------------------------
Build finished at 2025-08-30T04:50:08Z
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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
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