patch to detect IPv6 on Cygwin

[Lapo Luchini]

New Cygwin release 1.7 (which will be released in a few months) will
contain IPv6 support, but rsync configure doesn't currently detect it.

I'm using the following patch to enable the detection:

--- origsrc/rsync-3.0.4/configure.in    2008-09-06 18:32:26.000000000 +0200
+++ src/rsync-3.0.4/configure.in        2009-02-15 20:38:41.532123700 +0100
@@ -198,8 +198,18 @@
                [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 toshiba v6d zeta; do
+       for i in cygwin inria kame linux-glibc linux-inet6 toshiba v6d
zeta; do
                case $i in
+               cygwin)
+                       AC_EGREP_CPP(yes, [
+#include <netinet/in.h>
+#ifdef _CYGWIN_IN6_H
+yes
+#endif],
+                               [ipv6type=$i;
+                               AC_DEFINE(INET6, 1, [true if you have IPv6])
+                               ])
+                       ;;
                inria)
                        # http://www.kame.net/
                        AC_EGREP_CPP(yes, [


-- 
Lapo Luchini - http://lapo.it/