How about relative path of lib: "use lib '../lib/';
Also, as suggested any developer can change his own PERL5LIB env variable - and put the /my/dev/his-spot/lib as first thing. If you have someone naming modules as existing and widely used Perl ones ... you're screwed sooner or latter :)
You can always just make a new namespace and put new stuff there. As in CompanyName::* - so CompanyName::System (CompanyName/System.pm)
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