本文介绍了eval`opam config env`有什么用?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在安装opam之后，它要求执行 eval`opam config env` .
After the installation of opam, it asks to do eval `opam config env`.
它的确切用法是什么?
推荐答案
它将设置环境变量，这对于工具链正常工作是必需的，例如CAML_LD_LIBRARY_PATH.
It will setup environment variables, that are necessary for the toolchain to work properly, e.g., CAML_LD_LIBRARY_PATH.
就像在Python的virtualenv中激活虚拟环境一样.
It is like activating virtual environment in Python's virtualenv.
如果要查看准确设置了哪些变量，则可以在不使用eval部分的情况下运行它:
If you want to see what variables are set exactly, the you can run it without the eval part:
$ opam config env
CAML_LD_LIBRARY_PATH="/home/ivg/.opam/4.02.1/lib/stublibs"; export CAML_LD_LIBRARY_PATH;
MANPATH=":/home/ivg/.opam/4.02.1/man"; export MANPATH;
PERL5LIB="/home/ivg/.opam/4.02.1/lib/perl5:"; export PERL5LIB;
OCAML_TOPLEVEL_PATH="/home/ivg/.opam/4.02.1/lib/toplevel"; export OCAML_TOPLEVEL_PATH;
PATH="/home/ivg/.opam/4.02.1/bin:/home/ivg/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"; export PATH;
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