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New xcode / ios programmer here, so this is a very newbie question 🙂Getting xcode to work, I have a very basic "hello world" program, built successfully in xcode11 and uploaded to my iPhone7+ running IOS13 Beta and it all works great.If I try to load it on an iPhone running 12.3, it seems the compiler is loading 13.0 libraries so many of the calls are not working. I set the deployment target to 12.3 under both the "info" and "build settings" area - is there somewhere else I need to make a change? I assumed it would be easy to write a program, then compile under different versions of IOS (within reason). Thanks in advance 🙂-Ralph