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dnl **
dnl ** IPv6 support
dnl **
AC_DEFUN([DOVECOT_IPV6], [
have_ipv6=no
AC_MSG_CHECKING([for IPv6])
AC_CACHE_VAL(i_cv_type_in6_addr,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>]],
[[struct in6_addr i; (void)i;]])],
[i_cv_type_in6_addr=yes],
[i_cv_type_in6_addr=no])])
if test $i_cv_type_in6_addr = yes; then
AC_DEFINE(HAVE_IPV6,, [Build with IPv6 support])
have_ipv6=yes
else
AC_ERROR([Can't build without IPv6 support.])
fi
AC_MSG_RESULT($i_cv_type_in6_addr)
])
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