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    if ((stat($target))[9] < (stat($source))[9]) {
        ... do work ...
    }

    if ($force or (stat($target))[9] < (stat($source))[9]) {
        ... do work ...
    }

GetOptions(
    'f' => \my $force,
...
        ... do work here
    };
};

  if (test_dep( -target => $thumbname, -depend => $info->{file} )) {
      ...
  }