You can use the FindBin module to get the path to the executable you are currently running.

Try:-

BEGIN {
  use FindBin qw( $BIN );
  use lib qw( $BIN );
}
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Or, if that doesn't work for you:-

#! /user/bin/perl -I .
BEGIN {
  use FindBin qw( $BIN );
  chdir $BIN;
}
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might also work for you.