I need to integrate Twitter into my Cocoa application.
I tried MGTwitterEngine class: https://github.com/mattgemmell/MGTwitterEngine/
However I got several errors when I attached files to my project: yajl_parse.h, OAToken.h and CJSONDeserializer.h needed and I don't know where to find them:

Can you suggest me how to make MGTwitterEngine working or another way to integrate Twitter into my Cocoa app?