diff -u -r ../mtr-66de3ecbab28b054b868a73fbb57f30549d770ac/net.h ./net.h
--- ../mtr-66de3ecbab28b054b868a73fbb57f30549d770ac/net.h	2016-05-03 05:01:11.000000000 -0400
+++ ./net.h	2016-06-21 10:03:22.706030491 -0400
@@ -21,6 +21,7 @@
 #include <arpa/inet.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
+#include <sys/select.h>
 #ifdef ENABLE_IPV6
 #include <netinet/ip6.h>
 #include <netinet/icmp6.h>