Using latest OS X as base SDK

Author: stigi

JSONKit.xcodeproj/project.pbxproj

@@ -306,7 +306,7 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.6;
 				ONLY_ACTIVE_ARCH = YES;
 				PRODUCT_NAME = JSONKit;
-				SDKROOT = macosx10.6;
+				SDKROOT = macosx;
 				WRAPPER_EXTENSION = framework;
 			};
 			name = Debug;
@@ -331,7 +331,7 @@
 				LD_DYLIB_INSTALL_NAME = "@executable_path/../Frameworks/$(EXECUTABLE_PATH)";
 				MACOSX_DEPLOYMENT_TARGET = 10.6;
 				PRODUCT_NAME = JSONKit;
-				SDKROOT = macosx10.6;
+				SDKROOT = macosx;
 				WRAPPER_EXTENSION = framework;
 			};
 			name = Release;