Ambari build fails at Files view

/Users/Jaimin/vagrant/ambari-vagrant/centos6.4/gerrit/gerrit-ambari/contrib/views/files/src/main/resources/ui/node_modules/async-disk-cache/node_modules/username/index.js:2
const os = require('os');
^^^^^
Use of const in strict mode.
SyntaxError: Use of const in strict mode.
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/Users/Jaimin/vagrant/ambari-vagrant/centos6.4/gerrit/gerrit-ambari/contrib/views/files/src/main/resources/ui/node_modules/async-disk-cache/index.js:24:16)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)