(CommandList
  children: [
    (C {(set)} {(-ex)})
    (C {(pushd)} {(python/manylinux1)})
    (C {(git)} {(clone)} {(../../)} {(arrow)})
    (C {(docker)} {(build)} {(-t)} {(arrow-base-x86_64)} {(-f)} {(Dockerfile-x86_64)} {(.)})
    (C {(docker)} {(run)} {(--shm-size) (Lit_Other '=') (2g)} {(--rm)} {(-e)} 
      {(Lit_VarLike 'PYARROW_PARALLEL=') (3)} {(-v)} {($ VSub_Name '$PWD') (Lit_Other ':') (/io)} {(arrow-base-x86_64)} {(/io/build_arrow.sh)}
    )
  ]
)