I want to build perl from source in a private location and make sure that it doesn't refer at all to any other existing perl installations. If I just do 
./Configure -de -Dprefix=/my/private/place

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Configure "helpfully" looks for an existing perl, i.e. /usr/bin/perl, and puts its library directories in @INC in my private build. No doubt this is usually the right thing to do. However, I want to build a hermetically sealed perl, as if there were no other perl installation available. What's the right thing to do?

In reply to Configure self-contained perl from source by eb710

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