I have a common little snippet I drop at the top of a lot of projects, to set use lookup paths relative to the running binary.
my $rundir;
BEGIN { use File::Basename; $rundir = dirname($0); }
use lib "$rundir/lib";
Then you can have
/any/old/random/place/script.pl
/any/old/random/place/lib/Foo.pm
and just use Foo, relocating the whole project at will. Obviously not perfect against the case of you running the script via alternate hardlinks or such, but...
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