Why does the library produce errors when I pull it?


I have tried to download the Java code from Github directly (https://github.com/datasift/datasift-java), and I have tried to pull the code just like the Getting Started guide said, but there are always build errors, saying that classes, like Function2 and io.higgs.http.client.Response, do not exist. Do I need to download other libraries? Could I possibly get a link to a verified working code?

More information:

running: Mac OS X 10.9.2
goal: pull data from Facebook using JSON arrays
using: netbeans