$conBuild = "rss_function";

##</code><code>##

$conBuild = $funcTable{rss_function};

##</code><code>##

%funcTable = ( 
 ....
 rss_function => \&actual_rss_function, 
  ...
);

##</code><code>##

...other code...
{
   no strict 'refs';
   print &$conBuild($data,$file,$num,$ty,1);
}
...other code...