And keep this in mind (from the docs linked above)
Note: From Hugo 0.43 we have added a build tag, extended that adds SCSS support . This needs a C compiler installed to build. You can enable this when building by:
I suspect you currently need to build from source. With Go >= 1.11 it’s also fairly easy to install without Mage:
go install --tags extended
Or
go build --tags extended
You need a C/C++ build chain for the target system installed, which is the reason why we currently only brebuild it for a set of OSes (even that was a fair amount of work).