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@@ -248,6 +248,14 @@
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# with pyproject.toml without a specified build backend.
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# If the default requirements change, also change them in the macro!
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requirements.add('setuptools >= 40.8', source='default build backend')
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+ # PEP 517 doesn't mandate depending on wheel when the default backend is used.
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+ # Historically, it used to be assumed as necessary, but later it turned out to be wrong.
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+ # See the removal in pip and build:
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+ # https://github.com/pypa/pip/pull/12449
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+ # https://github.com/pypa/build/pull/716
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+ # However, the requirement *will* be generated by setuptools anyway
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+ # as part of get_requires_for_build_wheel().
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+ # So we might as well keep it to skip one redundant step.
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requirements.add('wheel', source='default build backend')
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requirements.check(source='build backend')
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