From 8a68cad1f77ac40f3834f7449ef794e37cba7914 Mon Sep 17 00:00:00 2001
From: Wayne Davison <wayned@samba.org>
Date: Thu, 26 Nov 2009 15:17:49 -0800
Subject: [PATCH] Add IPv6 detection on cygwin.

---
 configure.in | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/configure.in b/configure.in
index bc9a67e4..57bf5382 100644
--- a/configure.in
+++ b/configure.in
@@ -196,7 +196,7 @@ AC_ARG_ENABLE(ipv6,
 		[don't even try to use IPv6]))
 if test x"$enable_ipv6" != x"no"; then
 	AC_MSG_CHECKING([ipv6 stack type])
-	for i in inria kame linux-glibc linux-inet6 solaris toshiba v6d zeta; do
+	for i in inria kame linux-glibc linux-inet6 solaris toshiba v6d zeta cygwin; do
 		case $i in
 		inria)
 			# http://www.kame.net/
@@ -283,6 +283,15 @@ yes
 				ipv6libdir=/usr/local/v6/lib;
 				AC_DEFINE(INET6, 1, [true if you have IPv6])])
 			;;
+		cygwin)
+			AC_EGREP_CPP(yes, [
+#include <netinet/in.h>
+#ifdef _CYGWIN_IN6_H
+yes
+#endif],
+				[ipv6type=$i;
+				AC_DEFINE(INET6, 1, [true if you have IPv6])])
+			;;
 		esac
 		if test "$ipv6type" != "unknown"; then
 			break
-- 
2.34.1