#if defined(__linux__) || defined(__FreeBSD__)
static int unix_close_range(unsigned int first, unsigned int last, int flags)
{
#  if !HAVE_CLOSE_RANGE
    return syscall(SYS_close_range, first, last, (unsigned int) flags);
#  else
    return close_range(first, last, flags);
#  endif
}
#endif