function tf = nc_isunlimitedvar_hdf4(ncfile,varname)     
% oct_mexnc backend for NC_ISUNLIMITEDVAR
try
    info = nc_getvarinfo (ncfile,varname);
catch 
    e = lasterror;
    switch ( e.identifier )
        case 'snctools:nc_getvarinfo:hdf4:variableNotChar'
            error(e.identifier,e.message);
        otherwise
            tf = false;
            return
    end
end

tf = info.Unlimited;