reproduce (this is a W=1 build):
        # https://github.com/ceph/ceph-client/commit/758e3b13187ab7e12eed0a51f51461c3f85a9fa5
        git remote add ceph-client https://github.com/ceph/ceph-client.git
        git fetch --no-tags ceph-client tls_logger
        git checkout 758e3b13187ab7e12eed0a51f51461c3f85a9fa5
        # 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 prepare