From 65840f1fd1856ccd403c4d10ef4ed30b3df0217b Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 22 Jan 2001 23:54:54 +0000
Subject: Added simple IPv6 recognition support

---
 acconfig.h   |  3 +++
 configure.in | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/acconfig.h b/acconfig.h
index b9087794e..817ecc7b5 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -36,3 +36,6 @@
 
 /* Define if you have the Kerberos4 libraries (including -ldes) */
 #undef KRB4
+
+/* Define if you want to enable IPv6 support */
+#undef ENABLE_IPV6
diff --git a/configure.in b/configure.in
index c6de40711..a1af285ab 100644
--- a/configure.in
+++ b/configure.in
@@ -237,6 +237,44 @@ exit (rc != 0 ? 1 : 0); }],[
 
 ])
 
+dnl **********************************************************************
+dnl Checks for IPv6
+dnl **********************************************************************
+
+AC_MSG_CHECKING([whether to enable ipv6])
+AC_ARG_ENABLE(ipv6,
+[  --enable-ipv6		Enable ipv6 (with ipv4) support
+  --disable-ipv6		Disable ipv6 support],
+[ case "$enableval" in
+  no)
+       AC_MSG_RESULT(no)
+       ipv6=no
+       ;;
+  *)   AC_MSG_RESULT(yes)
+       AC_DEFINE(ENABLE_IPV6)
+       ipv6=yes
+       ;;
+  esac ],
+
+  AC_TRY_RUN([ /* is AF_INET6 available? */
+#include <sys/types.h>
+#include <sys/socket.h>
+main()
+{
+ if (socket(AF_INET6, SOCK_STREAM, 0) < 0)
+   exit(1);
+ else
+   exit(0);
+}
+],
+  AC_MSG_RESULT(yes)
+  AC_DEFINE(ENABLE_IPV6)
+  ipv6=yes,
+  AC_MSG_RESULT(no)
+  ipv6=no,
+  AC_MSG_RESULT(no)
+  ipv6=no
+))
 
 dnl **********************************************************************
 dnl Checks for libraries.
-- 
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