The .dualLivedDiffConfig file in this directory contains the file mapping from the Filter::Simple CPAN distribution to bleadperl as of 2009-03-07. You can test the program from the main distribution directory with the following command: (provided you have a CPAN.pm installation with a working setup) perl -Ilib script/dualLivedDiff -c example/.dualLivedDiffConfig -d Filter::Simple -b path/to/your/bleadperl/checkout You can add the option --output filter-simple.diff to write the diff to a file instead of STDOUT (where the CPAN.pm blurb goes as well). One option that's not shown by this example is the "base-path-in-blead" option. By setting it, the specified path is prepended to all paths in the blead perl checkout. Example (in YAML) that could be used to simplify the diff configuration for the Attribute::Handlers module: base-path-in-blead: ext/Attribute-Handlers