How tell vcpkg to use -isystem for package include directory

[quyykk]

Packages can be considered system libraries and as such they should use the -isystem for gcc/clang instead of -I. I encountered this because clang emits a certain warning inside SDL2 files which is not ideal. Adding the include directories with -isystem would fix this, instead of -I which is how they are currently specified.

I'm using vcpkg as submodule with the CMake integration.

Is there any way to change this?

[JackBoosY]

Create a new toolchain file or modify the current toolchain settings.

[a4z]

I do not have the feeling this is a useful answer

how to modify, what is required