controlling which project header file Xcode will include

Question

My Xcode project builds to variations of the same product using two targets. The difference between the two is only on which version of an included library is used. For the

Answer 1

USE_HEADERMAP=NO is overkill for some projects. It might be enough to just use HEADERMAP_INCLUDES_FLAT_ENTRIES_FOR_TARGET_BEING_BUILT=NO.

Documentation here:
https://developer.apple.com/library/archive/documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html