1 files changed, 56 insertions, 0 deletions

diff --git a/am/ipv6.m4 b/am/ipv6.m4
new file mode 100644
index 000000000..2357314b9
--- /dev/null
+++ b/am/ipv6.m4
@@ -0,0 +1,56 @@
+dnl This file is part of GNU Mailutils.  -*- autoconf -*-
+dnl Copyright (C) 2011 Free Software Foundation, Inc.
+dnl
+dnl GNU Mailutils is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl GNU Mailutils is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AC_DEFUN([MU_ENABLE_IPV6],
+   [AC_ARG_ENABLE(ipv6,                     
+     [AC_HELP_STRING([--enable-ipv6], [enable IPv6 support])],
+     [status_ipv6=$enableval],
+     [status_ipv6=maybe])
+     
+    if test $status_ipv6 != no; then
+      working_ipv6=no
+      AC_EGREP_CPP(MAILUTILS_AF_INET6_DEFINED,[
+#include <sys/socket.h>
+#if defined(AF_INET6)
+MAILUTILS_AF_INET6_DEFINED
+#endif
+],[working_ipv6=yes])
+
+      AC_CHECK_TYPE([struct sockaddr_storage],
+                    [working_ipv6=yes], [working_ipv6=no],
+                    [#include <sys/socket.h>])
+      AC_CHECK_TYPE([struct sockaddr_in6],
+                    [working_ipv6=yes], [working_ipv6=no],
+                    [#include <sys/types.h>
+                     #include <netinet/in.h>])
+      AC_CHECK_TYPE([struct addrinfo],
+                    [working_ipv6=yes], [working_ipv6=no],
+                    [#include <netdb.h>])
+      AC_CHECK_FUNC([getnameinfo],
+                    [working_ipv6=yes], [working_ipv6=no],
+                    [#include <netdb.h>])
+
+      if test $working_ipv6 = no; then
+        if test $status_ipv6 = yes; then
+          AC_MSG_ERROR([IPv6 support is required but not available])
+        fi
+      fi
+      status_ipv6=$working_ipv6
+      if test $status_ipv6 = yes; then
+        AC_DEFINE_UNQUOTED([MAILUTILS_IPV6],1,
+                           [Define to 1 if IPv6 support is enabled])
+      fi
+    fi])
\ No newline at end of file