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diff -u -r ../mutt-1.7.1/getdomain.c ./getdomain.c
--- ../mutt-1.7.1/getdomain.c 2016-10-08 15:30:21.000000000 -0400
+++ ./getdomain.c 2016-10-08 17:58:14.895654111 -0400
@@ -46,7 +46,9 @@
hints.ai_family = AF_UNSPEC;
/* A DNS name can actually be only 253 octets, string is 256 */
+#ifdef _SC_HOST_NAME_MAX
if ((node_len = sysconf(_SC_HOST_NAME_MAX)) == -1)
+#endif
node_len = STRING;
node = safe_malloc(node_len + 1);
if (gethostname(node, node_len))