Spack 3.0 发布，软件包生成工具

Spack 3.0 发布。Spack 是一个 Slackware Linux 和它的衍生品系统的独立软件包生成工具。提供一个简单清晰、安全灵活的制作软件包，减少代码工作量。

更新日志：

In this release, the CPIO-based package format is definitively adopted as the native Spack's package format. This allows the project to be a complete and standalone package manager instead of being just a package generator. Nevertheless, it is still possible to use it in this way and to generate traditional Slackware packages.

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