We made some changes in the library (which is still in development, and will be published next week). The new code will not work with the generated API you are trying to download.
My advice to you is to clone our repository and then update it to the state of the API (1.2.4737): hg update 20121220-1.2.4737-beta
Then you will be able to compile and make the changes you need.
Good luck
And I'm just curious, what are you trying to do? Is something missing in the library that we should add in next releases?