[build-system]
requires = ["setuptools",
            "wheel",
            "cython>=0.29.21",
            "numpy==1.16.0; python_version <= '3.7'",
            "numpy==1.17.3; python_version == '3.8'",
            "numpy==1.19.3; python_version == '3.9'",
            "numpy; python_version >= '3.10'",
            ]

# To ensure the best compatibility, try to match the numpy reqs
# where possible to the following used by scipy and the minimum
# of our normal numpy requirements in setup.py
# https://github.com/scipy/oldest-supported-numpy/blob/master/setup.cfg