Xcode not reporting missing header files

So I'm new to Xcode, but I'm noticing some disturbing behavior with my current c project. it seems it is not reporting headers it can't find, which is making all kinds of harder to diagnose errors, like "implicit function declaration not allowed in c99, etc. Anyone have any other ideas on why this might be?

I think the latest one was "ssl.h", so maybe it was finding it in the sdk and not the version under my project I needed to use (boringssl)?

Xcode not reporting missing header files
 
 
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