I had to prefix all spine-c structs and functions with "sp". :puke: Sorry for the change, but some libraries were having naming conflicts. You can define SPINE_SHORT_NAMES before including spine-c headers if you want to use structs and functions without the "sp" prefix, as it was before. Eg, spine-sfml and spine-cocos2d-iphone do this because I don't think there are naming conflicts there. spine-cocos2dx uses the "sp" prefix, so you may need to update any spine-c API you use to have the prefix.