To continue on what the Anonymous Monk posted, if you're using use Callback; to import, you have two options.

• Call import instead of use.

  Callback->VERSION(2.4);       # use Callback 2.4;
  Callback->import();           # use Callback;
  Callback->import(qw( ... ));  # use Callback qw( ... );
  [download]

• Tell Perl Callback is already loaded then use use as normal.

  my $mod = 'Callback';
  $mod =~ s{::}{/}g;
  $INC{"$mod.pm"} = 1;
  [download]

Don't use <pre></pre>. Use <c>...</c> instead. And close your tags!

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