+dnl ----------------------------------------------------------------
+AC_CHECK_HEADERS( sys/event.h )
+if test "${ac_cv_header_sys_event_h}" = yes; then
+AC_MSG_CHECKING(for kqueue system call)
+AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(int argc, char **argv)
+{
+ int kqfd = kqueue();
+ exit (kqfd == -1 ? 1 : 0);
+}]])],[AC_MSG_RESULT(yes)
+AC_DEFINE(HAVE_KQUEUE,1, [define if your system supports kqueue])],[AC_MSG_RESULT(no)],[AC_MSG_RESULT(no)])
+fi
+