Sometimes during the build process, you may see the error:

```
You need to have Ruby and Sass installed and
in your PATH for this task to work.
```

This means your project requires Ruby and Sass to be able to run. You can install this by using the following commands before the rest of your build commands: 

```
PATH=$(ruby -r rubygems -e 'puts Gem.user_dir')/bin:$PATH
gem install --user-install sass
```