Thanks for taking the time to respond.
I wrote "The steps I'm planning to follow are: ...". It looks like most, if not all, of your first paragraph is based on an assumption that I have completed (or at least attempted) these steps. I haven't performed any of the steps shown: the order of these steps and the details of any individual step may change based on responses to my post (in fact, thanks to your next point, one has changed already).
By the way, it's "-Dusethreads" (no "i").
Thanks for the correction. I've updated my post.
I found instances of useithreads in perlthrtut, perl -V output and Config.pm but I haven't seen usethreads anywhere. Could you point me to documentation where -D values are described?
By the way, I call my installs 5.14.2 and 5.14.2t. No need for the leading "perl-", no need for some long descriptor.
Thanks for the advice. The perl- prefix was based on usage throughout perlbrew. The suffixes are just a matter of personal preference.
In reply to Re^2: App::perlbrew - Compiling Perl with thread support