What should I do with "build.xml" to get built .js source

I’m new to cesium so this problem might be a very ‘rookie’ question.

I pulled the source from GitHub, copied the cesium folder to the “htdocs” folder of my local Apache server.

I tried to open the HelloWorld page(http://localhost/cesium/Apps/HelloWorld.html) and got this error:

Failed to load resource: the server responded with a status of 404 (Not Found) http://localhost/cesium/Build/Cesium/Cesium.js

Failed to load resource: the server responded with a status of 404 (Not Found) http://localhost/cesium/Build/Cesium/Widgets/widgets.css

  1. Uncaught ReferenceError: Cesium is not defined

I checked the location but only to find out that there was no “Build/” folder under the specified directory. I guess I hadn’t got the built .js scripts yet, but I had no idea how to get those scripts.

BTW, I cannot access cesiumjs.org. I tried several VPNs but they didn’t help. Any ideas on that? Thanks in advance.

404 - File or directory not found.

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