Thought so too, so I tried gem install sassc. No luck though 🫤

Separate from the SASS gem, then? I added the result of bundle install to OP for clarity, and that says Using sassc 2.4.0 among others.

So on Arch I get a handful of hits in the AUR searching for “libsass”. Do I want the Ruby module, the Perl one, or the C implementation?

(I told you to expect dumb questions) :D