node-gyp is a cross-platform command-line tool written in Node.js for compiling native addon modules for Node.js. It contains a vendored copy of the gyp-next project that was previously used by the Chromium team, extended to support the development of Node.js native addons.
node-gyp是一个使用Node.js编写的跨平台的命令行工具，用来编译node.js的原生插件模块(C++编写的？)。它包含曾被Chrom团队使用的gyp-next副本。
但是它不能用来编译node.js本身。
Multiple target versions of Node.js are supported (i.e. 0.8, ..., 4, 5, 6, etc.), regardless of what version of Node.js is actually installed on your system (node-gyp downloads the necessary development files or headers for the target version).
支持不同版本的Node.js，不管你实际安装的Node.js版本是多少。（node-gyp会下载需要的开发文件或者头文件）
https://github.com/nodejs/node-gyp
https://www.cnblogs.com/harrychinese/p/gyp.html
上述博文称，node-gpy实际上是python的一个包，但是并没有被pypi收录。