What I meant was that libsass is not the only sass compiler available to this part of the internet. Sure, it was the Sass compiler programmed by the team behind Sass, but there is a specification of what a sass parser should implement (https://github.com/sass/embedded-protocol) and plenty of parsers that do not use libsass. Sass is not a program, it’s a way to write stylesheets.
My point:
or (very old)