ubuntu14.04安装pomelo：

npm install -g pomelo@1.2.3

却给个警告：

gyp WARN EACCES user "root" does not have permission to access the dev dir "/root/.node-gyp/0.12.7"

后在github上node-gyp的issue中找到解决方法：

npm install -g --unsafe-perm --verbose pomelo@1.2.3

参考:Warning "root" does not have permission to access the dev dir