_XOPEN_SOURCE
#if defined(__APPLE__) && defined(__MACH__) && !defined(_XOPEN_SOURCE)
#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
|| (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
|| (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
#ifndef _XOPEN_SOURCE
#ifndef _XOPEN_SOURCE
#ifndef _XOPEN_SOURCE
#ifndef _XOPEN_SOURCE
#if defined(OMITTED__D_XOPEN_SOURCE_600) && !defined(_XOPEN_SOURCE)
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_XOPEN_SOURCE)
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_XOPEN_SOURCE)
#elif _XOPEN_SOURCE - 0 >= 600
#elif _XOPEN_SOURCE - 0 >= 500
#ifdef _XOPEN_SOURCE
#if _XOPEN_SOURCE - 0 >= 800
#elif _XOPEN_SOURCE - 0 >= 700
#ifndef _XOPEN_SOURCE
#ifndef _XOPEN_SOURCE