how do I know that the "unusual" package is available on that server - or on *any* server if truth be told?
For standalone scripts and apps, the "modern" approach (taken from other systems like Ruby and Python) is to bundle such scripts with a cpanfile that describes the dependencies that your scripts will need. This way, you do not have to query whether such a dependency is on your destination server or not; you declare such a dependency instead, so that tools like cpanm can install those for you.
In addtion, should you need to depend on exact versions of a particular module, tools like Carton will read the cpanfile to get that particular version installed for your usage.
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