+AH_TEMPLATE(HAVE_EPOLL, [define to enable epoll support])
+AC_ARG_WITH(epoll, [ --with-epoll Enable epoll(2) support])
+HAS_EPOLL=""
+if test "$with_epoll" = no; then HAS_EPOLL=no; fi
+if test -z "$HAS_EPOLL"; then
+ AC_CHECK_LIB(c, epoll_ctl, [:], [HAS_EPOLL=no])
+fi
+if test -z "$HAS_EPOLL"; then
+ AC_CHECK_HEADER(sys/epoll.h, [], [HAS_EPOLL=no])
+fi
+if test "$HAS_EPOLL" != no; then HAS_EPOLL=yes; fi
+if test "$with_epoll" = yes -a "$HAS_EPOLL" = no; then
+ AC_MSG_ERROR([*** cannot find epoll support on this system])
+fi
+if test "$HAS_EPOLL" = yes; then
+ AC_DEFINE(HAVE_EPOLL)
+fi
+