I've used stuff like this 

  my $state = 'TX';
  my $mod="State::$state::formulas"; 
  eval 'use '.$mod.';' ; 
  if ($@) {die '***ERROR***',$@}

[download]
But see Re^2: Using Google APIs for Lattitude for more comments about $@

In reply to Re: Imagination greater than reality? by huck
in thread Imagination greater than reality? by writch

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