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1. Runtime Version Check

   if (floor(NSAppKitVersionNumber) <= NSAppKitVersionNumber10_5) {
     /* On a 10.5.x or earlier system */
   } else if (floor(NSAppKitVersionNumber) <= NSAppKitVersionNumber10_6) {
     /* On a 10.6 - 10.6.x system */
   } else {
     /* Lion or later system */
   }
   

   http://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKit.html