:: Synchronizing package databases... build-support-manual downloading... build-support downloading... core-staging downloading... extra-staging downloading... core-testing downloading... core downloading... extra-testing downloading... extra downloading... :: Starting full system upgrade... there is nothing to do ==> Building in chroot for [extra-staging-with-build-support] (i486)... ==> Synchronizing chroot copy [/var/lib/archbuild/extra-staging-with-build-support-i486/root] -> [build]...done ==> Making package: python-scikit-learn 1.6.1-1.0 (Thu May 8 08:41:21 2025) ==> Retrieving sources... -> Found scikit-learn-1.6.1.tar.gz ==> Validating source files with sha256sums... scikit-learn-1.6.1.tar.gz ... Passed gpg: Warning: using insecure memory! ==> Appending keys from archlinux32.gpg... gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! gpg: Warning: using insecure memory! ==> Updating trust database... gpg: Warning: using insecure memory! gpg: next trustdb check due at 2025-06-16 ==> Making package: python-scikit-learn 1.6.1-1.0 (Thu May 8 08:41:30 2025) ==> Checking runtime dependencies... ==> Installing missing dependencies... resolving dependencies... looking for conflicting packages... Packages (16) blas-3.12.1-2.0 cblas-3.12.1-2.0 lapack-3.12.1-2.0 mpdecimal-4.0.0-2.153 python-3.13.3-1.0 python-charset-normalizer-3.4.0-1.0 python-idna-3.10-1.0 python-packaging-25.0-1.0 python-platformdirs-4.3.6-1.0 python-pooch-1.8.2-3.0 python-requests-2.32.3-1.0 python-urllib3-1.26.20-3.0 python-joblib-1.4.2-2.0 python-numpy-2.2.0-1.0 python-scipy-1.14.1-1.0 python-threadpoolctl-3.5.0-2.0 Total Installed Size: 240.85 MiB :: Proceed with installation? [Y/n] checking keyring... checking package integrity... loading package files... checking for file conflicts... :: Processing package changes... installing mpdecimal... installing python... Optional dependencies for python python-setuptools: for building Python packages using tooling that is usually bundled with Python python-pip: for installing Python packages using tooling that is usually bundled with Python python-pipx: for installing Python software not packaged on Arch Linux sqlite: for a default database integration [installed] xz: for lzma [installed] tk: for tkinter installing python-joblib... Optional dependencies for python-joblib python-numpy: for array manipulation [pending] python-lz4: for compressed serialization installing blas... installing cblas... installing lapack... installing python-numpy... Optional dependencies for python-numpy blas-openblas: faster linear algebra installing python-platformdirs... installing python-packaging... installing python-charset-normalizer... installing python-idna... installing python-urllib3... Optional dependencies for python-urllib3 python-brotli: Brotli support python-certifi: security support python-cryptography: security support python-idna: security support [installed] python-pyopenssl: security support python-pysocks: SOCKS support installing python-requests... installing python-pooch... Optional dependencies for python-pooch python-paramiko: for SFTP downloads python-tqdm: for printing a download progress bar installing python-scipy... Optional dependencies for python-scipy python-pillow: for image saving module installing python-threadpoolctl... :: Running post-transaction hooks... (1/1) Arming ConditionNeedsUpdate... ==> Checking buildtime dependencies... ==> Installing missing dependencies... resolving dependencies... looking for conflicting packages... Packages (14) libedit-20250104_3.1-1.1 llvm-libs-18.1.8-4.1 meson-1.7.2-1.0 ninja-1.12.1-2.0 patchelf-0.18.0-1.1 python-pyproject-hooks-1.2.0-3.1 python-pyproject-metadata-0.9.0-1.0 python-tqdm-4.67.1-2.0 cython-3.0.11-1.0 meson-python-0.17.1-1.0 openmp-19.1.7-1.0 python-build-1-1.3 python-installer-1-1.3 python-wheel-1-1.3 Total Installed Size: 169.29 MiB :: Proceed with installation? [Y/n] checking keyring... checking package integrity... loading package files... checking for file conflicts... :: Processing package changes... installing cython... installing libedit... installing llvm-libs... installing openmp... Optional dependencies for openmp cuda: offloading to NVIDIA GPUs hsa-rocr: offloading to AMD GPUs installing python-pyproject-hooks... installing python-build... installing python-installer... installing python-wheel... installing ninja... installing python-tqdm... Optional dependencies for python-tqdm python-requests: telegram [installed] installing meson... installing patchelf... installing python-pyproject-metadata... installing meson-python... Optional dependencies for meson-python python-colorama: colored output :: Running post-transaction hooks... (1/1) Arming ConditionNeedsUpdate... ==> Retrieving sources... -> Found scikit-learn-1.6.1.tar.gz ==> WARNING: Skipping all source file integrity checks. ==> Extracting sources... -> Extracting scikit-learn-1.6.1.tar.gz with bsdtar ==> Starting prepare()... ==> Starting build()... * Getting build dependencies for wheel... Traceback (most recent call last): File "/usr/lib/python3.13/site-packages/pyproject_hooks/_impl.py", line 402, in _call_hook raise BackendUnavailable( ...<4 lines>... ) pyproject_hooks._impl.BackendUnavailable: Cannot import 'mesonpy' ERROR Backend 'mesonpy' is not available. ==> ERROR: A failure occurred in build(). Aborting... ==> ERROR: Build failed, check /var/lib/archbuild/extra-staging-with-build-support-i486/build/build used straw: :with_build_support: build@euronuc-i486