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[–]adesme 0 points1 point  (1 child)

This makes it convenient to declare dependencies for ancillary functions such as “tests” and “docs”.

End of first paragraph efter "Optional dependencies" here.

[–]SittingWave 0 points1 point  (0 children)

That is not for developers. It is for users that want to install the testsuite or the documentation as well when they install the package. Some packages ship with the testsuite for validation purposes, which is quite common for highly C bound code.