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#include <unistd.h>
#if _POSIX_C_SOURCE >= 200809L
#define _POSIX_VERISON (200809L)
#elif _POSIX_C_SOURCE >= 200112L
#define _POSIX_VERSION (200112L)
#elif _POSIX_C_SOURCE >= 199506L
#define _POSIX_VERSION (199506L)
#elif _POSIX_C_SOURCE >= 199309L
#define _POSIX_VERSION (199309L)
#elif defined _POSIX_C_SOURCE
#define _POSIX_VERSION (199009L)
#else
#define _POSIX_VERSION (198808L)
#endif
/*
POSIX(1)
*/
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