"Get Started" example fails

I follow Get Started (https://ionicframework.com/getting-started/). When I execute the command “ionic start myApp sidemenu”. I saw this error. Does anybody have an idea to solve it? My cordova is already 6.0.

$ ./node_modules/ionic/bin/ionic start myApp sidemenu
Creating Ionic app in folder /mnt/net-data/Workspace/IonicGetStarted/myApp based on sidemenu project
Downloading: https://github.com/driftyco/ionic-app-base/archive/master.zip
[=============================] 100% 0.0s
Downloading: https://github.com/driftyco/ionic-starter-sidemenu/archive/master.zip
[=============================] 100% 0.0s
Updated the hooks directory to have execute permissions
Update Config.xml
Initializing cordova project

Unable to add plugins. Perhaps your version of Cordova is too old. Try updating (npm install -g cordova), removing this project folder, and trying again. (CLI v1.7.14)

Your system information:

Cordova CLI: 6.0.0
Ionic Version: 1.2.4
Ionic CLI Version: 1.7.14
Ionic App Lib Version: 0.7.0
OS: /bin/sh: lsb_release: command not found
Node Version: v4.2.2

I’m using Gentoo.