• Get the MoltenVK SDK from https://vulkan.lunarg.com/sdk/home#mac.

• Make sure to check off System Global Installation:

• When running flutter/tools/gn, add the --impeller-enable-vulkan flag, e.g. ./flutter/tools/gn --impeller-enable-vulkan --unopt --mac-cpu arm64

You should now be able to build and run the Vulkan host tests, e.g. out/host_debug_unopt_arm64/impeller_unittests --gtest_filter="*Vulkan*".