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In the case ``.pyx`` files are passed as ``sources and`` ``Cython`` is **not** installed in the build environment, ``setuptools`` may also try to look for the equivalent ``.cpp`` or ``.c`` files. :arg str name: the full name of the extension, including any packages -- ie. *not* a filename or pathname, but Python dotted name :arg list[str|os.PathLike[str]] sources: list of source filenames, relative to the distribution root (where the setup script lives), in Unix form (slash-separated) for portability. 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