From 29b7110bc62fc7360ccaa010ba91f479b05264de Mon Sep 17 00:00:00 2001
From: "Barak A. Pearlmutter" <barak+git@pearlmutter.net>
Date: Wed, 28 Dec 2016 12:01:30 +0100
Subject: [PATCH] avoid incomplete type issue
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src/iodined.c: In function ‘read_dns’:
src/iodined.c:2062:34: error: invalid application of ‘sizeof’ to incomplete type ‘struct in6_pktinfo’
  char control[CMSG_SPACE(sizeof (struct in6_pktinfo))];
                                  ^
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 3d241b0..ef194d9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,6 +56,10 @@ AC_PROG_CC
 AC_PROG_CC_STDC
 AS_IF([test "x${ac_cv_prog_cc_stdc}" = xno],
       [AC_MSG_WARN([Unable to engage Standard C (C99) option])],)
+# This is to avoid
+#    error: invalid application of ‘sizeof’ to incomplete type ‘struct in6_pktinfo’
+# whose definition is guarded by _GNU_SOURCE
+AC_USE_SYSTEM_EXTENSIONS
 AX_CFLAGS_WARN_ALL
 AC_PROG_INSTALL