### config.yml
# Assetic Configuration
assetic:
    debug:          %kernel.debug%
    use_controller: false
    # java: /usr/bin/java
    java: e:/outils/Java/jre6-64/bin/java.exe
    sass: e:/outils/Ruby193/bin/sass.bat
    filters:
        sass: ~
        cssrewrite: ~

### layout.html.twig
{% stylesheets filter='cssrewrite, sass' output='css/*.css'
            'bundles/lndbim/css/main.scss'
        %}
            <link href="{{ asset_url }}" type="text/css" rel="stylesheet" />
        {% endstylesheets %}