4.19 Mac OS doesn't build new c++ project

Just tried to update to 4.19 today, I’m running on Mac OS High Sierra with XCode v. 8.2.1. Creating new project from the launcher gives the following error. Previous versions compile fine.

The project could not be compiled. Would you like to open it in Xcode?

Running Mono…

Setting up Mono
/Users/Shared/Epic Games/UE_4.19/Engine /Users/Shared/Epic Games/UE_4.19/Engine/Binaries/Mac
Performing full C++ include scan (building a new target)
Creating makefile for *** (no existing makefile)
@progress push 5%
Parsing headers for Editor
Running UnrealHeaderTool "/Users/Sid/Documents/Unreal Projects/
/.uproject" "/Users//Documents/Unreal Projects/***/Intermediate/Build/Mac/Editor/Development/Editor.uhtmanifest" -LogCmds=“loginit warning, logexit warning, logdatabase error” -Unattended -WarningsAsErrors -installed
Reflection code generated for Editor in 9.8161057 seconds
@progress pop
Performing 6 actions (8 in parallel)
[1/6] Compile SharedPCH.Engine.h
error: unknown warning option ‘-Wno-undefined-var-template’; did you mean ‘-Wno-undefined-internal’? [-Werror,-Wunknown-warning-option]
ERROR: UBT ERROR: Failed to produce item: /Users/
/Documents/Unreal Projects/
Total build time: 21.70 seconds (Local executor: 0.00 seconds)


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