This is Perl module MouseX::NativeTraits. INSTALLATION MouseX::NativeTraits installation is straightforward. If your CPAN shell is set up, you should just be able to do $ cpan MouseX::NativeTraits Download it, unpack it, then build it as per the usual: $ perl Makefile.PL $ make && make test Then install it: $ make install DOCUMENTATION MouseX::NativeTraits documentation is available as in POD. So you can do: $ perldoc MouseX::NativeTraits to read the documentation online with your favorite pager. Goro Fuji (gfx)