Of LIB=, Makemaker, and alternate locations for libraries of perl extensions and apps

[George Szynal]

For those who want/need to install a Perl app or extension without perturbing the default perl library tree. Possible reasons:    1. Disambiguating the existing libs from your libs (for testing perhaps)    2. Not wanting to or not having rights to login as a supervisor (or as a user with admin rights)    3. Prefer to encapsulate resources in a local tree (easy to move / remove, or whatever reason)    4. Yet another reason I may have overlooked   lessons learned are:   a.  utilize the 'LIB= argument when creating your makefile           example:  perl  Makefile.PL  LIB=/users/george/myperlprogram/lib/   b.  avoid the temptation to tweak @INC (purported to make use of that library location)        ...and instead utilize 'use lib'           example:  in  MathServer.pm  and  MathClient.pm  (for my projects purposes)                          use MathSystem                       becomes                             use lib MathSystem     c.  then we discovered an even better way is:           example:  perl  Makefile.PL  LIB="./lib/"          ## ie. use a relative path...          which makes it OK to :                          use MathSystem                               ##  no need for  'use lib MathSystem'     Resulting benefits:  No need for admin rights to install, no need to push a path onto @INC at runtime