Currently, Am running Big Sur with the latest updates and downloaded the Chess source code to learn some Objective-C and Game Development from an example. Source OpenSource Apple - Chess 410.4.1 - https://opensource.apple.com/source/Chess/Chess-410.4.1/ Retrieving the error messages. Error 1 language /Users/__user__/Desktop/Chess-410.4.1/Chess.xcconfig Chess.xcconfig line 7: Unable to find included file "DEVELOPER_DIR/AppleInternal/XcodeConfig/PlatformSupport.xcconfig" Error 2 language /Users/__user__/Desktop/Chess-410.4.1/Chess.xcconfig:7: included file 'DEVELOPER_DIR/AppleInternal/XcodeConfig/PlatformSupport.xcconfig' does not exist Error 3 language No profiles for 'com.apple.Chess' were found Xcode couldn't find any Mac App Development provisioning profiles matching 'com.apple.Chess'. I have gone to the targets and signing section and added automatic signing and I was greeted by the statement I am not able to use game center capabilities. Signing for "MBChess" requires a development team. Thank you for any readers, this is my first post!