# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2019-10-06 23:35:53 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1180990087141740545) RT @mgratzer: Take care when adding SPM to a ~10yrs old Xcode project. Debugging worked but building for the app store failed. Reason: My d…