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sigwait.3: Note glibc 2.26 feature test macro changes
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -40,7 +40,13 @@ Feature Test Macro Requirements for glibc (see
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.sp
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.ad l
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.BR sigwait ():
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_POSIX_C_SOURCE
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.RS 4
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Since glibc 2.26:
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_POSIX_C_SOURCE >= 199506L
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.br
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Glibc 2.25 and earlier:
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_POSIX_C_SOURCE
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.RE
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.ad b
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.SH DESCRIPTION
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The
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