Piwik\AssetManager\UIAssetMerger\StylesheetUIAssetMerger::getLessCompiler PHP Method

    private static function getLessCompiler()
    {
        if (!class_exists("lessc")) {
            throw new Exception("Less was added to composer during 2.0. ==> Execute this command to update composer packages: \$ php composer.phar install");
        }
        $less = new lessc();
        return $less;
    }