reproduce (this is a W=1 build):
        # https://github.com/plbossart/sound/commit/cd24ac936a37b583771317da3d0865c6857cca92
        git remote add plbossart-sound https://github.com/plbossart/sound
        git fetch --no-tags plbossart-sound sdw/parse-functions
        git checkout cd24ac936a37b583771317da3d0865c6857cca92
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash