Add IPv6 detection on cygwin.

diff --git a/configure.in b/configure.in
index bc9a67e..57bf538 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -196,7 +196,7 @@ AC_ARG_ENABLE(ipv6,
                [don't even try to use IPv6]))
 if test x"$enable_ipv6" != x"no"; then
        AC_MSG_CHECKING([ipv6 stack type])
                [don't even try to use IPv6]))
 if test x"$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/
                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])])
                        ;;
                                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 "$ipv6type" != "unknown"; then
                        break
                esac
                if test "$ipv6type" != "unknown"; then
                        break