This is Perl module Encode::UTF8Mac.

INSTALLATION

Encode::UTF8Mac installation is straightforward. If your CPAN shell is set up,
you should just be able to do

    % cpan Encode::UTF8Mac

Download it, unpack it, then build it as per the usual:

    % perl Makefile.PL
    % make && make test

Then install it:

    % make install