AC_PATH_PROG(NSUPDATE, nsupdate)

AC_MSG_CHECKING(for executable nsupdate)

if test -x "$NSUPDATE"; then

AC_DEFINE_UNQUOTED([NSUPDATE_PATH], ["$NSUPDATE"], [The path to nsupdate])

AC_MSG_RESULT(yes)

AC_MSG_CHECKING(for nsupdate 'realm' support')

if AC_RUN_LOG([echo realm |$NSUPDATE >&2]); then

AC_MSG_RESULT([yes])

AC_DEFINE_UNQUOTED([HAVE_NSUPDATE_REALM], 1, [Whether to use the 'realm' directive with nsupdate])

else

AC_MSG_RESULT([no])

AC_MSG_WARN([Will build without the 'realm' directive])

fi

else

AC_MSG_RESULT([no])

AC_MSG_ERROR([nsupdate is not available])

fi