Changes to Xcode project files

projects/xcode/libzrtp.xcodeproj/project.pbxproj

@@ -503,7 +503,8 @@
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				ONLY_ACTIVE_ARCH = NO;
 				PREBINDING = NO;
-				SDKROOT = "";
+				SDKROOT = macosx10.5;
+				VALID_ARCHS = "i386 ppc x86_64";
 			};
 			name = Debug;
 		};