[build-system]
requires = [
    "wheel",
    "setuptools",
    "Cython>=0.23.4",
    "numpy==1.8.2; python_version<='3.4'",
    "numpy==1.9.3; python_version=='3.5'",
    "numpy==1.12.1; python_version=='3.6'",
    "numpy==1.13.1; python_version>='3.7'",
]
