--- lib/apputils/net-server.c.orig	2016-12-01 16:31:24.000000000 -0600
+++ lib/apputils/net-server.c	2016-12-05 10:51:19.000000000 -0600
@@ -67,6 +67,26 @@
 /* XXX */
 #define KDC5_NONET                               (-1779992062L)
 
+/* AI_NUMERICSERV as a value for the `ai_flags' member
+* of `struct addrinfo' of header <netdb.h> has only
+* been available since:
+*
+*   POSIX 1003.1-2008, Issue 7
+*   glibc 2.3.4
+*   Mac OS X 10.6
+*   etc.
+*
+* Fortunately, its main purpose seems to be only
+* to optimize calls of `getaddrinfo', and because it
+* is meant to be a bit flag, it can therefore be
+* [relatively] safely ignored by defining it to have
+* the value zero.
+*/
+
+#ifndef AI_NUMERICSERV
+#define AI_NUMERICSERV 0
+#endif
+
 static int tcp_or_rpc_data_counter;
 static int max_tcp_or_rpc_data_connections = 45;