React Native运行样例的时候出错解决办法

目标平台：iOS 开发平台： macOS

在运行样例时报错：

Error watching file for changes: EMFILE
{"code":"EMFILE","errno":"EMFILE","syscall":"Error watching file for changes:","filename":null}
Error: Error watching file for changes: EMFILE
    at exports._errnoException (util.js:1008:11)
    at FSEvent.FSWatcher._handle.onchange (fs.js:1406:11)

有人说：升级最新MacOS系统后，需要重新安装一次brew install watchman

此时会提示你：
Error: You must `brew link autoconf automake` before watchman can be installed
VictordeMacBook-Pro:AwesomeProject victor$ brew link autoconf automake
在brew install watchman之前要：brew link autoconf automake
OK照做，然后再运行就成功了