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available on the current system. Otherwise, the feature is only
included if requested via a command line '--with-X' option, or if
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'available' -- if true, the feature is available for installation on the
current system. The default setting is 'True'.
'optional' -- if true, the feature's inclusion can be controlled from the
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requires it. The default setting is 'True'.
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defining a 'tests' feature that removes all the 'tests' subpackages
provided by other features. The default for this argument is an empty
list. (Note: the named package(s) or modules must exist in the base
distribution when the 'setup()' function is initially called.)
other keywords -- any other keyword arguments are saved, and passed to
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feature is included or excluded, respectively. So, for example, you
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added or removed from the distribution as appropriate.
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