As Traverse is shipped with "barebones" Perl libraries. To be able to use custom Perl libraries, it is recommended to isolate the required Perl module for your script and its dependencies on a separate server (via 'yum install' or Strawberry Perl). Once they are downloaded, you may copy them to the <TRAVERSE_HOME>\plugin directory (to keep future upgrades from deleting the libraries from within other Traverse directories) on the BVE server.
Once the Perl module(s) are available within the plugins directory, in your Perl script, you can provide a path to them using:
use Cwd 'abs_path';
use lib (abs_path(dirname($0)). "/../../");
The above assumes the script is located under <TRAVERSE_HOME>\plugin\monitors\YOUR-SCRIPT-DIRECTORY and File::Readbackwards is located under <TRAVERSE_HOME>\plugin (<TRAVERSE_HOME>\plugin\File\Readbackwards\Readbackwards.pm).