为装pt10.3.10 修改osx版本号 遇到困难求助
网上看教程要修改修改SystemVersion.plist 但是其属性为只读所以用chmod +x /System/Library/CoreServices/SystemVersion.plist 命令修改但是终端显示chmod: Unable to change file mode on /System/Library/CoreServices/SystemVersion.plist: Operation not permitted求解!!