使用预装的 ICU (system-icu) 构建

【Build with a pre-installed ICU (system-icu)】

Node.js 可以链接到系统上已安装的 ICU 构建。事实上，大多数 Linux 发行版已经预装了 ICU，这个选项可以使其重用操作系统中其他组件使用的相同数据集。

【Node.js can link against an ICU build already installed on the system. In fact, most Linux distributions already come with ICU installed, and this option would make it possible to reuse the same set of data used by other components in the OS.】

仅需要 ICU 库本身的功能，例如 String.prototype.normalize() 和 WHATWG URL 解析器，在 system-icu 下是完全支持的。需要 ICU 地区数据的功能，例如 Intl.DateTimeFormat，可能会完全或部分支持，这取决于系统上安装的 ICU 数据的完整性。

【Functionalities that only require the ICU library itself, such as String.prototype.normalize() and the WHATWG URL parser, are fully supported under system-icu. Features that require ICU locale data in addition, such as Intl.DateTimeFormat may be fully or partially supported, depending on the completeness of the ICU data installed on the system.】