--- embedaddon/mtr/gtk.c	2013/07/21 23:43:42	1.1.1.1
+++ embedaddon/mtr/gtk.c	2016/11/01 09:33:48	1.1.1.2
@@ -17,7 +17,7 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-#include <config.h>
+#include "config.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -615,8 +615,10 @@ void gtk_loop(void) 
   net_iochannel = g_io_channel_unix_new(net_waitfd());
   g_io_add_watch(net_iochannel, G_IO_IN, gtk_net_data, NULL);
 #ifdef ENABLE_IPV6
-  dns_iochannel = g_io_channel_unix_new(dns_waitfd6());
-  g_io_add_watch(dns_iochannel, G_IO_IN, gtk_dns_data6, NULL);
+  if (dns_waitfd6() > 0) {
+    dns_iochannel = g_io_channel_unix_new(dns_waitfd6());
+    g_io_add_watch(dns_iochannel, G_IO_IN, gtk_dns_data6, NULL);
+  }
 #endif
   dns_iochannel = g_io_channel_unix_new(dns_waitfd());
   g_io_add_watch(dns_iochannel, G_IO_IN, gtk_dns_data, NULL);