OPAM和OCaml安装

Question

我在设置我的OCaml环境时遇到了一些问题，下面是这个页面：

https://github.com/realworldocaml/book/wiki/Installation-Instructions

然而，我有一些我无法解决的问题。我正在使用macOS 10.12.5并使用zsh。

Brew安装opam时没有错误或警告。我相信我的问题是与环境变量(??)不同步。当我运行一些建议的命令时，下面是一些输出：

opam开关：

--     -- 4.04.2  Official 4.04.2 release
--     -- 4.05.0  Official 4.05.0 release
system  C system  System compiler (4.05.0)
# 251 more patched or experimental compilers, use '--all' to show

[WARNING] The environment is not in sync with the current switch.
          You should run: eval `opam config env`

eval 'opam config env':

CAML_LD_LIBRARY_PATH="/Users/Alex/.opam/system/lib/stublibs:/usr/local/lib/ocaml/stublibs"; export CAML_LD_LIBRARY_PATH;
OPAMUTF8MSGS="1"; export OPAMUTF8MSGS;
MANPATH="/Users/Alex/.opam/system/man:"; export MANPATH;
PERL5LIB="/Users/Alex/.opam/system/lib/perl5"; export PERL5LIB;
OCAML_TOPLEVEL_PATH="/Users/Alex/.opam/system/lib/toplevel"; export OCAML_TOPLEVEL_PATH;
PATH="/Users/Alex/.opam/system/bin:/usr/local/opt/opencv3/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/local/MacGPG2/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Wireshark.app/Contents/MacOS"; export PATH;

opam安装基础：

The following actions will be performed:
  ∗  install sexplib v0.9.2                   [required by base]
  ∗  install base    v0.9.3
===== ∗  2 =====
Do you want to continue ? [Y/n] y

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[base] Archive in cache
[sexplib] Archive in cache

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of sexplib failed at "jbuilder build -p sexplib -j 4".

#=== ERROR while installing sexplib.v0.9.2 ====================================#
# opam-version 1.2.2
# os           darwin
# command      jbuilder build -p sexplib -j 4
# path         /Users/Alex/.opam/system/build/sexplib.v0.9.2
# compiler     system (4.05.0)
# exit-code    127
# env-file     /Users/Alex/.opam/system/build/sexplib.v0.9.2/sexplib-35995-e7966f.env
# stdout-file  /Users/Alex/.opam/system/build/sexplib.v0.9.2/sexplib-35995-e7966f.out
# stderr-file  /Users/Alex/.opam/system/build/sexplib.v0.9.2/sexplib-35995-e7966f.err



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
  ∗  install base v0.9.3
The following actions failed
  ∗  install sexplib v0.9.2
No changes have been performed

为了这个问题的目的，我展示了我的尝试安装基地，但最终想要安装核心，utop，绿洲等。任何帮助都是非常感谢的！

编辑：I使用撇号(')，而我应该使用backticks (‘)。没有经验的shell用户的证据我想..。

Answer 1

当你在做的时候，你应该使用背板(在许多键盘上的1键的左边)

eval `opam config env`

如果在查找回退时有困难，则可以使用另一种shell语法。

eval $(opam config env)

注意:此命令不应打印任何内容，您看到的环境变量值表明您调用它是错误的(这个变量应该由shell来查看)。