From perldoc lib:

For each directory in LIST (called $dir here) the lib module also checks to see if a directory called $dir/$archname/auto exists. If so the $dir/$archname directory is assumed to be a corresponding architecture specific directory and is added to @INC in front of $dir. lib.pm also checks if directories called $dir/$version and $dir/$version/$archname exist and adds these directories to @INC.

This means that: 

$ perl -V:archname
archname='i486-linux';

$ perl -V:version
version='5.8.8';

$ perl -wle 'use lib "TempLib";print for grep /TempLib/, @INC;'
TempLib

$ mkdir -p TempLib/i486-linux/auto
$ perl -wle 'use lib "TempLib";print for grep /TempLib/, @INC;'
TempLib/i486-linux
TempLib

$ mkdir -p TempLib/5.8.8/auto
$ perl -wle 'use lib "TempLib";print for grep /TempLib/, @INC;'
TempLib/5.8.8
TempLib/i486-linux
TempLib

$ mkdir -p TempLib/5.8.8/i486-linux/auto
$ perl -wle 'use lib "TempLib";print for grep /TempLib/, @INC;'
TempLib/5.8.8/i486-linux
TempLib/5.8.8
TempLib/i486-linux
TempLib

$ find TempLib/
TempLib/
TempLib/i486-linux
TempLib/i486-linux/.auto
TempLib/i486-linux/auto
TempLib/5.8.8
TempLib/5.8.8/auto
TempLib/5.8.8/i486-linux
TempLib/5.8.8/i486-linux/auto

So the proper solution is to not include sepecific directory's in your use lib code but to create the correct directorys and let use lib figure out which architecture to use.

update: Added output of find

In reply to Re: How to instrust Perl to load the right modules based on architecture? by Animator
in thread How to instrust Perl to load the right modules based on architecture? by sunshine_august

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