diff -Naur cmake-2.6.2/Source/cmGlobalXCodeGenerator.cxx cmake-cthing-2.6.2/Source/cmGlobalXCodeGenerator.cxx
--- cmake-2.6.2/Source/cmGlobalXCodeGenerator.cxx	2008-09-24 11:34:36.000000000 -0700
+++ cmake-dash-2.6.2/Source/cmGlobalXCodeGenerator.cxx	2008-12-05 00:39:01.000000000 -0800
@@ -2440,6 +2444,21 @@
                              this->CreateObjectReference(mainGroup));
   this->RootObject->AddAttribute("buildSettings", group);
   this->RootObject->AddAttribute("buildStyles", listObjs);
+  if(this->XcodeVersion >= 31)
+    {
+    this->RootObject->AddAttribute("compatibilityVersion",
+                                   this->CreateString("Xcode 3.1"));
+    }
+  else if(this->XcodeVersion >= 30)
+    {
+    this->RootObject->AddAttribute("compatibilityVersion",
+                                   this->CreateString("Xcode 3.0"));
+    }
+  else if(this->XcodeVersion >= 24)
+    {
+    this->RootObject->AddAttribute("compatibilityVersion",
+                                   this->CreateString("Xcode 2.4"));
+    }
   this->RootObject->AddAttribute("hasScannedForEncodings",
                              this->CreateString("0"));
   // Point Xcode at the top of the source tree.