Thank you, @a740g! And thanks, Steve. I’ll try reinstalling XCode. Appreciate the help! +1 to you both. 
(Yesterday, 10:22 AM)Cybermonkey342 Wrote: I also guess a problem with Xcode. I had the very same error message compiling QB64pe 3.14.1 on my old Mac mini M1 after updating to Sequoia. Version 3.14.0 compiled flawlessly though. As said, on my new M4 everything compiles fine.Thanks, cybermonkey342. I appreciate a monkey helping out this ape!