安裝npm和node，編譯OCaml的文件與js_of_ocaml了錯誤後，因此我做了opam switch reinstall system：使兼容ocaml的，camlp4，PPX，節點，js_of_ocaml，ocamlbuild
:testweb $ opam switch reinstall system
Your system compiler has been changed. Do you want to upgrade your OPAM installation ? [Y/n] y
=-=- Upgrading system -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[WARNING] base-ocamlbuild.base is not available because it requires OCaml >= 3.10 & < 4.03. Skipping.
[WARNING] camlp4.4.02+system is not available because your system doesn't comply with preinstalled &
ocaml-version >= "4.02" & ocaml-version < "4.03". Skipping.
[WARNING] ppx_tools.4.02.3 is not available because your system doesn't comply with ocaml-version >=
"4.02.0" & ocaml-version < "4.03.0". Skipping.
The following dependencies couldn't be met:
- deriving -> camlp4
Your request can't be satisfied:
- camlp4 is not available because your system doesn't comply with ocaml-version >= "4.04".
No solution found, exiting
The former package state can be restored with opam switch import "/Users/softtimur/.opam/backup/state-20160418124642.export" --switch system
然後，我意識到ocamlfind沒有工作了：
:testweb $ ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T
-bash: /Users/softtimur/.opam/system/bin/ocamlfind: No such file or directory
PS：node --version給v6.1.0; npm --version給出3.8.6; ocaml -version給出The OCaml toplevel, version 4.03.0。 js_of_ocaml --version是2.7，但是在opam swtich reinstall system之後，它給出了-bash: /Users/softtimur/.opam/system/bin/js_of_ocaml: No such file or directory。
有誰知道該怎麼做才能使所有這些軟件包兼容？
早些時候：這裏是編譯錯誤安裝npm和node，後做opam switch reinstall system前：
:testweb $ ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T
Failure("Ast_mapper: OCaml version mismatch or malformed input")
File "cubes.ml", line 1:
Error: Error while running external preprocessor
Command line: /Users/softtimur/.opam/system/lib/js_of_ocaml/./ppx_js '/var/folders/fn/0rmvqqbs4k76lg5g6b7kll100000gn/T/camlppxffe989' '/var/folders/fn/0rmvqqbs4k76lg5g6b7kll100000gn/T/camlppx02e06a'
另一種方式也給了一個錯誤：
:testweb $ ocamlfind ocamlc -package js_of_ocaml -syntax camlp4o -package js_of_ocaml.syntax -linkpkg -o cubes.byte cubes.ml
Fatal error: unknown C primitive `caml_is_printable'
File "cubes.ml", line 1:
Error: Error while running external preprocessor
Command line: camlp4 '-I' '/usr/local/lib/ocaml/camlp4' '-I' '/Users/softtimur/.opam/system/lib/js_of_ocaml' '-parser' 'o' '-parser' 'op' '-printer' 'p' 'pa_js.cmo' 'cubes.ml' > /var/folders/fn/0rmvqqbs4k76lg5g6b7kll100000gn/T/ocamlpp8b28e8
最初： 我最初的目標是編寫和編譯cubes.ml這樣1）它包裝一個OCaml函數來創建一個可以在web中調用的JS函數; 2）可以在Linux下的命令行中測試OCaml函數和字節碼。
cubes.ml如下：
let() =
let oneArgument (a: int) = a + 100 in
Js.Unsafe.global##.jsOneArgument := Js.wrap_callback oneArgument;
print_string "hello\n";
exit 0
然後，ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T應該產生T這樣./T應返回hello。並且js_of_ocaml T -o cubes.js應該生成cubes.js，使得cubes.js的功能jsOneArgument可以很好地被其他JS或HTML文件調用。
之前我搞砸了包，./T回到Unimplemented Javascript primitive caml_pure_js_expr!，這就是爲什麼我安裝npm，node，等...
是不是'$節點cubes.js'就夠了嗎？ – zakki
你的意思是在命令行中運行'node cubes.js'嗎？你能否詳細說明一下？ – SoftTimur
是的。 node.js在Linux下的命令行中輸出'hello'。 – zakki