You could:

• Alter @INC at program compile time rather than perl compile time, so your CTB users do:

  use lib '/usr/foss/packages/foss-perllib';
  [download]

  which unshifts your directory onto the front of @INC.
  
  
• Edit: the following does not work, I was mistaken as shown by choroba and ikegami. (While there are no doubt gory reasons why it is so, it seems an uncharacteristic lack of DWIMery from Perl ...) Continue with the @INC you've compiled in, and instruct your CTB users to require a specific version, e.g.:

  use autodie 2.29;
  [download]

  which ensures that perl will keep looking until it finds the specified version (in your directory).

Hope this helps!

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