diff --git a/Xcode/OpenSceneGraph/OpenSceneGraph.xcodeproj/project.pbxproj b/Xcode/OpenSceneGraph/OpenSceneGraph.xcodeproj/project.pbxproj
index dc2619beb..461e8f3b0 100644
--- a/Xcode/OpenSceneGraph/OpenSceneGraph.xcodeproj/project.pbxproj
+++ b/Xcode/OpenSceneGraph/OpenSceneGraph.xcodeproj/project.pbxproj
@@ -37915,6 +37915,7 @@
 				GCC_OPTIMIZATION_LEVEL = 0;
 				MACOSX_DEPLOYMENT_TARGET = 10.4;
 				PREBINDING = NO;
+				SDKROOT = /Developer/SDKs/MacOSX10.4u.sdk;
 			};
 			name = Development;
 		};
@@ -37931,6 +37932,7 @@
 				GCC_MODEL_TUNING = G5;
 				GCC_OPTIMIZATION_LEVEL = s;
 				MACOSX_DEPLOYMENT_TARGET = 10.4;
+				SDKROOT = /Developer/SDKs/MacOSX10.4u.sdk;
 				STRIP_STYLE = "non-global";
 			};
 			name = Deployment;