This is the Perl distribution Class-Null. Installing Class-Null is straightforward. ## Installation with cpanm If you have cpanm, you only need one line: % cpanm Class::Null If you are installing into a system-wide directory, you may need to pass the "-S" flag to cpanm, which uses sudo to install the module: % cpanm -S Class::Null ## Installing with the CPAN shell Alternatively, if your CPAN shell is set up, you should just be able to do: % cpan Class::Null ## Manual installation As a last resort, you can manually install it. Download the tarball, untar it, then build it: % perl Makefile.PL % make && make test Then install it: % make install If you are installing into a system-wide directory, you may need to run: % sudo make install ## Documentation Class-Null documentation is available as POD. You can run perldoc from a shell to read the documentation: % perldoc Class::Null