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