[Mailman-Developers] Upgrading from Mailman 3.0 installed with mailman-bundler: sassc error

Terri Oda writes:

the solution is

1. install rubygem-sass
2. update mailman_web/development.py so that COMPRESS_PRECOMPILERS asks for sass instead of sassc

I suppose the idea was to depend on sassc and libsass rather than Ruby. Do we really need to introduce a dependency on Ruby? Won't that pull in a whole ecosystem?