AC_FUNC_MALLOC
AC_CHECK_FUNCS([usleep select socket inet_pton inet_ntop])
-AC_CHECK_HEADERS([fcntl.h sys/socket.h sys/select.h sys/time.h sys/types.h unistd.h windows.h winsock2.h errno.h sys/epoll.h sys/event.h])
+AC_CHECK_HEADERS([fcntl.h sys/socket.h sys/select.h sys/time.h sys/types.h unistd.h windows.h winsock2.h errno.h sys/epoll.h sys/event.h ares.h])
AC_CHECK_LIB(ws2_32, main, [ LIBS="$LIBS -lws2_32" ], [])
AC_CHECK_LIB(ssl, SSL_read, [