diff --git a/PXSourceList.xcodeproj/project.pbxproj b/PXSourceList.xcodeproj/project.pbxproj
index 40641a3..f55efed 100644
--- a/PXSourceList.xcodeproj/project.pbxproj
+++ b/PXSourceList.xcodeproj/project.pbxproj
@@ -426,7 +426,7 @@
 		29B97313FDCFA39411CA2CEA /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0450;
+				LastUpgradeCheck = 0500;
 			};
 			buildConfigurationList = C01FCF4E08A954540054247B /* Build configuration list for PBXProject "PXSourceList" */;
 			compatibilityVersion = "Xcode 3.2";
@@ -697,11 +697,11 @@
 		C01FCF4F08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(NATIVE_ARCH_ACTUAL)";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.7;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
 				VALID_ARCHS = "i386 x86_64";
@@ -711,10 +711,10 @@
 		C01FCF5008A954540054247B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(NATIVE_ARCH_ACTUAL)";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.7;
 				SDKROOT = macosx;
 				VALID_ARCHS = "i386 x86_64";
 			};