Add 0 to _POSIX_SEMAPHORES. Will backport to 2.4.
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@ -16,7 +16,9 @@
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family of functions must indicate this by defining
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_POSIX_SEMAPHORES. */
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#ifdef _POSIX_SEMAPHORES
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#if _POSIX_SEMAPHORES == -1
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/* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so
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we need to add 0 to make it work there as well. */
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#if (_POSIX_SEMAPHORES+0) == -1
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#define HAVE_BROKEN_POSIX_SEMAPHORES
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#else
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#include <semaphore.h>
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