reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/0b7ff9ce1af3206c716ea6eb2b7ffe4144ffd290
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 6.17/zen-sauce
        git checkout 0b7ff9ce1af3206c716ea6eb2b7ffe4144ffd290
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um olddefconfig
        make W=1 O=build_dir ARCH=um SHELL=/bin/bash