I think you want to set CMAKE_SYSTEM_VERSION to 10.0.17763.0, but I’m not sure if you will also need to set CMAKE_SYSTEM_NAME to something as well. Ordinarily, you would set variables like these in your toolchain file, but I see that you’re using vcpkg’s toolchain file. I think that supports being able to pass in another toolchain file to chain along to, but you’d have to look up how to do that. Alternatively, you might be able to get away with setting these variables on the cmake command line using something along the lines of cmake -DCMAKE_SYSTEM_VERSION=10.0.17763.0 ...