```ruby
require "json"
require "sinatra"
require "sinatra/json"
require "slim"
require "sass"

require "rubulex/version"
require "rubulex/app"
require "rubulex/regexp_parser"

module Rubulex

end
```

Use sassc instead of sass
user
```ruby
require "json"
require "sinatra"
require "sinatra/json"
require "slim"
require "sassc"

require "rubulex/version"
require "rubulex/app"
require "rubulex/regexp_parser"

module Rubulex

end
```
assistant