http://qs321.pair.com?node_id=11109879

ovedpo15 has asked for the wisdom of the Perl Monks concerning the following question:

Hello monks,
I have a module XYZ.
I would like to use it in my code $USE_XYZ is enabled. I tried to add: 
begin {
    if($ENV{USE_XYZ} == 1) {
        use XYZ;
    }
}

[download]
but it looks like it still being used, even though $USE_XYZ is undefined.
How can I acheive this behaviour?

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