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<p>I don't have any specific answers to your questions, but I do have some relevant suggestions that might help:</i>
<p>I'm not sure why you're setting INSTALL_BASE. Its not necessary when making arbitrary perl installs anyways. Adding the perl you want to use in that session to PATH should be enough.</p>
<p>Its likely that all of these installs you've fiddled with are using the same directory (~/.cpan) to stage and build perl modules. That might be trouble.</p>
<p>You can see how I manage hand built perl installs at [id://774873].</p>
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