title: Conditional Environment Variables in Xcode
body: <p>I would like to create some environment viables in Xcode for heavy debugging such as:</p>
  
  <pre><code>  NSDebugEnabled
    NSZombieEnabled
    MallocStackLogging
    MallocStackLoggingNoCompact
  </code></pre>
  
  <p>Is it possible to create a new build configuration that is a duplicate of "Debug" where those environmental variables are set to YES, but i can just switch to regular Debug and those would be off again?</p>
  
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