To answer your question regarding the difference between -Dusethreads and -Duseithreads---there is no -Duseithreads. According to the INSTALL doc:

"By default, Configure selects ithreads if -Dusethreads is specified".

As for the next question, you didn't compile it with threads because you used -Duseithreads when you should have used -Dusethreads.

In reply to Re: configuration options for local perl install with threads by Khen1950fx
in thread configuration options for local perl install with threads by tphyahoo

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