Currently if you would
bundle update you would end up with sassc (2.0.0) which breaks on precompiling assets with
Error: error C function image-url: initialised constant SassC::Script::String
Locking down the sassc gem solves this issue.
gem 'sassc', '~> 1.0', require: false
I will try and figure out what breaks and get a solution for sassc ‘~> 2.0’…