[build-system]
requires = ["flit"]
build-backend = "flit.buildapi"

[tool.flit.metadata]
module = "backcall"
author = "Thomas Kluyver"
author-email = "thomas@kluyver.me.uk"
home-page = "https://github.com/takluyver/backcall"
description-file = "README.rst"
classifiers = [
        'License :: OSI Approved :: BSD License',
        'Programming Language :: Python :: 2',
        'Programming Language :: Python :: 2.7',
        'Programming Language :: Python :: 3',
    ]

[build-system]
requires = ["flit_core >=2,<4"]
build-backend = "flit_core.buildapi"

[tool.flit.metadata]
module = "backcall"
author = "Thomas Kluyver"
author-email = "thomas@kluyver.me.uk"
home-page = "https://github.com/takluyver/backcall"
description-file = "README.rst"
classifiers = [
        'License :: OSI Approved :: BSD License',
        'Programming Language :: Python :: 2',
        'Programming Language :: Python :: 2.7',
        'Programming Language :: Python :: 3',
    ]

Use flit_core as build backend
Use flit_core as build backend
