I am not going to ignore the above answer because I suspect that this may be related to different versions of theos , and the answer above definitely set me on the right path to find what I need. It turns out, at least for my version of theos , the setup environment variable is -
ADDITIONAL_OBJCFLAGS = -fobjc-arc
( ADDITIONAL_CFLAGS also an option, but I donβt think there is a possibility, when it is important, whether you allow the inclusion of ARC in direct code).
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