reproduce (this is a W=1 build):
        # https://github.com/intel/linux-intel-lts/commit/09c7bb5439e48682e81937413314d9cf3759d81e
        git remote add intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-lts 6.6/dovetail-xenomai
        git checkout 09c7bb5439e48682e81937413314d9cf3759d81e
        # 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 arch/x86/kernel/