wro4j-extensions/src/main/java/ro/isdc/wro/extensions/processor/css/BourbonCssProcessor.java
@Override
  protected RubySassEngine newEngine() {
    final RubySassEngine engine = super.newEngine();
    engine.addRequire(BOURBON_GEM_REQUIRE);
    return engine;
  }
@Override
  protected RubySassEngine newEngine() {
    final RubySassEngine engine = super.newEngine();
    engine.addRequire(BOURBON_GEM_REQUIRE);
    return engine;
  }
A getter used for lazy loading, overrides RubySassEngine#getEngine() and ensure the
bourbon gem is imported (required).