Surprised they don't even mention Libsass?
Seems to be blocked by #231, unfortunately—thought you’re right it’s pretty odd there’s nothing about libsass at all.
In the meantime, I made Bootstrap-Sass a Component you can try out with Harp, if you’d like. Harp uses libsass, and with the troublesome mixins commented out for now, you can at least use everything else.
This is a nice touch. Thanks guys!
Been waiting for something like this!