(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:BOOST_VERSION)
          op: assign_op.Equal
          rhs: {<1.65.1>}
          spids: [52]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:BOOST_VERSION_UNDERSCORE)
          op: assign_op.Equal
          rhs: 
            {
              (braced_var_sub
                token: <Id.VSub_Name BOOST_VERSION>
                suffix_op: 
                  (suffix_op.PatSub
                    pat: {(word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\.'>)}
                    replace: {<_>}
                    replace_mode: Id.Lit_Slash
                  )
              )
            }
          spids: [55]
        )
      ]
    )
    (C {<wget>} {<--no-check-certificate>} 
      {<https> <Id.Lit_Colon ':'> <'//dl.bintray.com/boostorg/release/'> 
        (${ Id.VSub_Name BOOST_VERSION) <'/source/boost_'> (${ Id.VSub_Name BOOST_VERSION_UNDERSCORE) <.tar.gz>
      } {<-O>} {<'/boost_'> (${ Id.VSub_Name BOOST_VERSION_UNDERSCORE) <.tar.gz>}
    )
    (C {<tar>} {<xf>} {<boost_> (${ Id.VSub_Name BOOST_VERSION_UNDERSCORE) <.tar.gz>})
    (C {<pushd>} {<'/boost_'> (${ Id.VSub_Name BOOST_VERSION_UNDERSCORE)})
    (C {<'./bootstrap.sh'>})
    (C {<'./bjam'>} {<Id.Lit_VarLike 'cxxflags='> <-fPIC>} {<Id.Lit_VarLike 'cflags='> <-fPIC>} 
      {<--prefix> <Id.Lit_Equals '='> <'/usr'>} {<--with-filesystem>} {<--with-date_time>} {<--with-system>} {<--with-regex>} {<install>}
    )
    (C {<popd>})
    (C {<rm>} {<-rf>} {<boost_> (${ Id.VSub_Name BOOST_VERSION_UNDERSCORE) <.tar.gz>} 
      {<boost_> (${ Id.VSub_Name BOOST_VERSION_UNDERSCORE)}
    )
  ]
)