#include "include/apple_availability.h"
#if __has_include(<unistd.h>)
-#include <unistd.h>
+# include <unistd.h>
+#endif
+
+#if __has_include(<sys/time.h>)
+# include <sys/time.h> // for gettimeofday and timeval
#endif
#if !defined(__APPLE__) && _POSIX_TIMERS > 0
-#define _LIBCPP_USE_CLOCK_GETTIME
+# define _LIBCPP_USE_CLOCK_GETTIME
#endif
#if defined(_LIBCPP_WIN32API)
# if _WIN32_WINNT >= _WIN32_WINNT_WIN8
# include <winapifamily.h>
# endif
-#else
-# if !defined(CLOCK_REALTIME)
-# include <sys/time.h> // for gettimeofday and timeval
-# endif // !defined(CLOCK_REALTIME)
#endif // defined(_LIBCPP_WIN32API)
#if defined(__ELF__) && defined(_LIBCPP_LINK_RT_LIB)
static_cast<__int64>(ft.dwLowDateTime)};
return time_point(duration_cast<duration>(d - nt_to_unix_epoch));
#else
-#if defined(CLOCK_REALTIME)
+#if defined(CLOCK_REALTIME) && defined(_LIBCPP_USE_CLOCK_GETTIME)
struct timespec tp;
if (0 != clock_gettime(CLOCK_REALTIME, &tp))
__throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed");
timeval tv;
gettimeofday(&tv, 0);
return time_point(seconds(tv.tv_sec) + microseconds(tv.tv_usec));
-#endif // CLOCK_REALTIME
+#endif
#endif
}