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round.3: Fix feature test macro requirements
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -48,7 +48,8 @@ Feature Test Macro Requirements for glibc (see
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.BR roundf (),
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.BR roundl ():
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.RS 4
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_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE;
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_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
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_POSIX_C_SOURCE\ >=\ 200112L;
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.br
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or
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.I cc\ -std=c99
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