mac 解决 node-gyp rebuild error

mac下不管是npm，还是cnpm一直都没有问题，当给kurento client js，安装包的时候报以下错误：

gyp ERR! build error
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack at ChildProcess.emit (events.js:182:13)
gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:239:12)
gyp ERR! System Darwin 16.7.0
gyp ERR! command "/usr/local/Cellar/node/10.9.0/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /Users/zhangying/Documents/www/kurento/kurento-client-js/node_modules/utf-8-validate
gyp ERR! node -v v10.9.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
npm WARN grunt-jscoverage@0.1.3 requires a peer of grunt@~0.4.1 but none is installed. You must install peer dependencies yourself.

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! utf-8-validate@1.2.2 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the utf-8-validate@1.2.2 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/zhangying/.npm/_logs/2018-09-08T03_07_51_380Z-debug.log

开始的时候，我以为是utf-8-validate的问题，其实不是。

解决办法：

# npm install -g bcrypt