Problems with missing template

[Stephen Torri]

I am trying to update the xine project library automake/autoconf system
to use autoconf-2.52 or above. In the m4 functions it has a function
called AC_CHECK_IP_MREQN defined below:

dnl AC_CHECK_IP_MREQN
dnl check for struct ip_mreqn in netinet/in.h
AC_DEFUN([AC_CHECK_IP_MREQN],
         [AC_CACHE_CHECK([for ip_mreqn], [ac_cv_have_ip_mreqn],
                [AC_EGREP_HEADER([ip_mreqn],
                        [netinet/in.h],
                        [ac_cv_have_ip_mreqn=yes],
                        [ac_cv_have_ip_mreqn=no])])
          if test $ac_cv_have_ip_mreqn = yes; then
             AC_DEFINE([HAVE_IP_MREQN],1,[Define this if you have
ip_mreqn in netinet/in.h])
          fi
])

If I run autoheader on this I get:
autoheader: missing template: HAVE_IP_MREQN

autoconf version: 2.53

Stephen