How to add NSDebug.h and use NSZombie in iPhone SDK
Are you setting the environment variable correctly? The step by step guide is Double-click an executable in the Executables group of your Xcode project. Click the Arguments tab. In the “Variables to be set in the environment:” section, make a variable called “NSZombieEnabled” and set its value to “YES”. You don’t need to #import NSDebug.h