As for why the poster may need it -- if you read through a lot of the posts here that talk about their "fine" experiences at work, you'll see that there's quite a few companies still using older versions of perl (typically in the 5.x series, but not 5.6) because latter versions of perl haven't gone through appropriate security audits, or that code that worked in 5.005 will break in 5.6, or for a number of other reasons. There's also cases where, as a developer of perl modules, you'd just like to see if a module works as expected until 5.005 in addition. Thus, having distributions of non-5.6 5.x perl makes both tasks easier; having the parallel 5.x and 5.6 perl set up and a trivial change of the command line can make things very easy to test.
Now, if you were asking why they were looking for perl *4*, that's a different question... :-)
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Dr. Michael K. Neylon - mneylon-pm@masemware.com
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"You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important
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