reproduce (this is a W=1 build):
        # https://github.com/isilence/linux/commit/161f99ad49ca48fa141161b409eac11a6b63c105
        git remote add isilence https://github.com/isilence/linux
        git fetch --no-tags isilence zc/rx-pp-provider
        git checkout 161f99ad49ca48fa141161b409eac11a6b63c105
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash