按照教程走：

# 先安装全局扩展包
composer global  require overtrue/package-builder

# 然后调用使用
package-builder build weather

# 爆出致命错误

  [Symfony\Component\Console\Exception\CommandNotFoundException]
  Command "package-builder" is not defined.

然后直接在bin中找到程序所在

cd ~/.composer/vendor/bin/

./package-builder  build weather

# bingo !