include(CheckCSourceRuns)

check_c_source_runs(
"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/event.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

int
main(int argc, char **argv)
{
   int kq;
   int n;
   int fd[2];
   struct kevent ev;
   struct timespec ts;
   char buf[80000];

   if (pipe(fd) == -1)
       exit(1);
   if (fcntl(fd[1], F_SETFL, O_NONBLOCK) == -1)
       exit(1);

   while ((n = write(fd[1], buf, sizeof(buf))) == sizeof(buf))
       ;

   if ((kq = kqueue()) == -1)
       exit(1);

   memset(&ev, 0, sizeof(ev));
   ev.ident = fd[1];
   ev.filter = EVFILT_WRITE;
   ev.flags = EV_ADD | EV_ENABLE;
   n = kevent(kq, &ev, 1, NULL, 0, NULL);
   if (n == -1)
       exit(1);

   read(fd[0], buf, sizeof(buf));

   ts.tv_sec = 0;
   ts.tv_nsec = 0;
   n = kevent(kq, NULL, 0, &ev, 1, &ts);
   if (n == -1 || n == 0)
       exit(1);

   exit(0);
}

" EVENT__HAVE_WORKING_KQUEUE)

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