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Compile error with MAC os

While trying to compile my project in MAC with xcode, there's an error that I can't figure out.

This error happens when I'm trying to use shared_timed_mutex

the compiler giave me this error: shared_timed_mutex' is unavailable: introduced in macos 10.12 , but my target OS was set to 10.13

however when I open a C++ project for testing(not ue4 C++, just a hello world project) and use shared_timed_mutex, it compiled without any issue, I wonder if there's any setting that I need to do for the project?

Product Version: UE 4.19
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asked Sep 02 '18 at 08:19 PM in Installation & Setup

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scw000000
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