In my attempt to check what's necessary to install po4a on Windows I tried to first install it from scratch on my Mac. I guess Windows users would use something like Strawberry Perl, and probably have direct access to cpanm. That seemed to be an issue on Mac. I could install it with cpan: ➜ cpan App::cpanminus Loading internal logger. Log::Log4perl recommended for better logging Reading '/Users/suzume/.cpan/Metadata' Database was generated on Tue, 05 Oct 2021 00:17:03 GMT App::cpanminus is up to date (1.7044). But then the shell could not find it: po4a on  master ➜ cpanm Module::Build zsh: command not found: cpanm I guess it's a path issue, but I'd expect cpan to get that right at install. So I installed cpanminus from Brew instead and it worked... After running Build installdeps, I end up stuck at SGMLS: po4a on  master ➜ perl Build installdeps Checking optional dependencies: Install SGMLS? [y ]y Loading internal logger. Log::Log4perl recommended for better logging Reading '/Users/suzume/.cpan/Metadata' Database was generated on Tue, 05 Oct 2021 00:17:03 GMT po4a on  master took 6s ➜ cpanm SGMLS ! Finding SGMLS on cpanmetadb failed. ! Finding SGMLS () on metacpan failed. ! Finding SGMLS () on mirror http://www.cpan.org failed. ! Couldn't find module or a distribution SGMLS So, what is that SGMLS thing that's required but can't be found ? -- Jean-Christophe Helary @brandelune https://mac4translators.blogspot.com https://sr.ht/~brandelune/omegat-as-a-book/