Index: examples/client.c
--- examples/client.c.orig
+++ examples/client.c
@@ -1266,6 +1266,9 @@ get_session(
     memset( &hints, 0, sizeof( struct addrinfo ) );
     hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
     hints.ai_socktype = COAP_PROTO_RELIABLE(proto) ? SOCK_STREAM : SOCK_DGRAM; /* Coap uses UDP */
+#ifndef AI_ALL
+#define AI_ALL 0
+#endif
     hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST | AI_NUMERICSERV | AI_ALL;
 
     s = getaddrinfo( local_addr, local_port, &hints, &result );