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this could be an error if _GNU_SOURCE was already defined differently
by the application.
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reportedly this is a semi-common practice among some BSDs and a few
other systems, and will improve application compatibility.
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the old behavior of exposing nothing except plain ISO C can be
obtained by defining __STRICT_ANSI__ or using a compiler option (such
as -std=c99) that predefines it. the new default featureset is POSIX
with XSI plus _BSD_SOURCE. any explicit feature test macros will
inhibit the default.
installation docs have also been updated to reflect this change.
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