npm install -g ios-deploy 失敗問題的解決方法

當使用Cordova或ionic命令行時，

npm install -g ios-deploy

或sudo npm install -g ios-deploy 都報錯，

如：

npm WARN lifecycle [email protected]~preinstall: cannot run in wd %s %s (wd=%s) [email protected] ./src/scripts/check_reqs.js && xcodebuild /usr/local/lib/node_modules/.staging/ios-deploy-298c9491
npm ERR! Darwin 15.3.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "ios-deploy"
npm ERR! node v5.8.0
npm ERR! npm  v3.7.3
npm ERR! path /usr/local/lib/node_modules/ios-deploy/build/Release/ios-deploy
npm ERR! code ENOENT
npm ERR! errno -2
npm ERR! syscall chmod

npm ERR! enoent ENOENT: no such file or directory, chmod '/usr/local/lib/node_modules/ios-deploy/build/Release/ios-deploy'
npm ERR! enoent ENOENT: no such file or directory, chmod '/usr/local/lib/node_modules/ios-deploy/build/Release/ios-deploy'
npm ERR! enoent This is most likely not a problem with npm itself
npm ERR! enoent and is related to npm not being able to find a file.
npm ERR! enoent

解決問題方法在 https://github.com/phonegap/ios-deploy/issues/188 可以找到，其實就是：

sudo npm install -g ios-deploy --unsafe-perm=true

這次倒給出了提示：

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!! WARNING: You are on OS X 10.11 El Capitan, you may need to add the
!!!! WARNING:   `--unsafe-perm=true` flag when running `npm install`
!!!! WARNING:   or else it will fail.
!!!! WARNING: link:
!!!! WARNING:   https://github.com/phonegap/ios-deploy#os-x-1011-el-capitan
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!