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Building with Meson

Note: this is for early adopters. It has been tested on Linux and macOS, and with Python 3.9-3.12. Windows will be tested soon. There is one CI job to keep the build stable. This may have rough edges, please open an issue if you run into a problem.

Developer build

Install build tools: Use one of:

  • mamba env create -f environment.yml && mamba activate numpy-dev

  • python -m pip install -r build_requirements.txt Note: also make sure you have pkg-config and the usual system dependencies for NumPy

Then install spin:

  • python -m pip install spin

Compile and install: spin build

This builds in the build/ directory, and installs into the build-install directory.

Then run the test suite or a shell via spin:

spin test
spin ipython

Alternatively, to use the package, add it to your PYTHONPATH:

export PYTHONPATH=${PWD}/build/lib64/python3.10/site-packages  # may vary
pytest --pyargs numpy

pip install

Note that pip will use the default build system, which is (as of now) still numpy.distutils. In order to switch that default to Meson, uncomment the build-backend = "mesonpy" line at the top of pyproject.toml.

After that is done, pip install . or pip install --no-build-isolation . will work as expected. As does building an sdist or wheel with python -m build, or pip install -e . --no-build-isolation for an editable install. For a more complete developer experience than editable installs, consider using spin instead though (see above).

Workaround for a hiccup on Fedora

  • Fedora does not distribute openblas.pc. Install the following file in ~/lib/pkgconfig/openblas.pc:
prefix=/usr
includedir=${prefix}/include
libdir=${prefix}/lib64

Name: openblas
Description: OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version
Version: 0.3.19
Cflags: -I${includedir}/openblas
Libs: -L${libdir} -lopenblas

Then build with:

spin build -- -Dpkg_config_path=${HOME}/lib/pkgconfig