"This is a headless server so having libraries splattered around isn't helpful"

Then don't do that. If you are using the system perl and a package is available in apt, use that, otherwise you need to install things in the right place (sudo cpanm Image::Grab), or (as detailed in other replies you already have) specify the correct paths for your cron jobs for where you have installed things.

In reply to Re^3: Perl app won't compile /run from cron by marto
in thread Perl app won't compile /run from cron by dazz

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