Cocos2dx Extensions

This page was useful:
http://www.cocos2d-x.org/boards/6/topics/19388

For Visual Studio, add the following argument to the build command line:
/I"\cocos2d-2.0-x-2.0.4\extensions" 

For Android.mk file, add the following line to the end
$(call import-module,extensions) \

For XCode, add the "extensions" folder to the project