ocaml opam install utop

报错

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=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of ocaml-migrate-parsetree failed at "jbuilder build -p ocaml-migrate-parsetree -j
        4".
[ERROR] The compilation of cppo failed at "jbuilder build -p cppo -j 4".
[ERROR] The compilation of topkg failed at "ocaml pkg/pkg.ml build --pkg-name topkg --dev-pkg false".

折腾半天，最后误打误撞找到一个解决办法

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 opam switch 4.06.0
 eval (opam config env)
  ~/.opam> opam install utop
The following actions will be performed:
  ∗  install conf-m4                 1           [required by ocamlfind]
  ∗  install result                  1.2         [required by lwt]
  ∗  install ocamlbuild              0.12.0      [required by react]
  ∗  install ocamlfind               1.7.3       [required by utop]
  ∗  install topkg                   0.9.1       [required by react]
  ∗  install jbuilder                1.0+beta16  [required by utop]
  ∗  install base-bytes              base        [required by camomile]
  ∗  install react                   1.2.1       [required by utop]
  ∗  install ocaml-migrate-parsetree 1.0.7       [required by lwt]
  ∗  install cppo                    1.6.0       [required by utop]
  ∗  install ppx_tools_versioned     5.0.1       [required by lwt]
  ∗  install camomile                0.8.7       [required by utop]
  ∗  install lwt                     3.1.0       [required by utop]
  ∗  install zed                     1.6         [required by lambda-term]
  ∗  install lwt_react               1.1.0       [required by utop]
  ∗  install lambda-term             1.12.0      [required by utop]
  ∗  install utop                    2.0.2     
===== ∗  17 =====
Do you want to continue ? [Y/n] Y

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫 
[camomile] Archive in cache
[cppo] Archive in cache
[jbuilder] Archive in cache
[lambda-term] Archive in cache
[lwt] Archive in cache
[lwt_react] Archive in cache
[ocaml-migrate-parsetree] Archive in cache
[ocamlbuild] Archive in cache
[ocamlfind] Archive in cache
[ppx_tools_versioned] Archive in cache
[react] Archive in cache
[result] Archive in cache
[topkg] Archive in cache
[utop] Archive in cache
[zed] Archive in cache

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫 
∗  installed conf-m4.1
∗  installed result.1.2
∗  installed ocamlfind.1.7.3
∗  installed base-bytes.base
∗  installed ocamlbuild.0.12.0
∗  installed jbuilder.1.0+beta16
∗  installed topkg.0.9.1
∗  installed cppo.1.6.0
∗  installed react.1.2.1
∗  installed ocaml-migrate-parsetree.1.0.7
∗  installed camomile.0.8.7
∗  installed ppx_tools_versioned.5.0.1
∗  installed zed.1.6
∗  installed lwt.3.1.0
∗  installed lwt_react.1.1.0
∗  installed lambda-term.1.12.0
∗  installed utop.2.0.2
Done.

=-=- lwt.3.1.0 installed successfully -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫 
=> Lwt 4.0.0 will make some breaking changes to packaging in late 2017. See
     https://github.com/ocsigen/lwt/issues/453