pyproject.toml

[build-system]
# Minimum requirements for the build system to execute.
requires = [
    "setuptools",
    "wheel",
    "Cython>=0.28.5",

    # use oldest-supported-numpy which provides the oldest numpy version with
    # wheels on PyPI
    #
    # see: https://github.com/scipy/oldest-supported-numpy/blob/master/setup.cfg
    "oldest-supported-numpy",

    "scipy>=0.19.1",
]