我想跑 make 涉及依赖 ocamlfind 但是当我尝试安装它时，它给了我循环依赖和依赖 ocaml-base-nox。
我发现我可以得到 ocaml-findlib 和 libfindlib-ocaml 它们相互依赖，只需一个命令即可同时安装： sudo apt install ocaml-findlib ocaml-findlib libfindlib-ocaml ocaml-base-nox-4.01.0 但是，剩余的依赖性返回 Package 'ocaml-base-nox-4.01.0' has no installation candidate。它确实提到了几个包，显然：
Package ocaml-base-nox-4.01.0 is a virtual package provided by:
ocaml-base-nox 4.01.0-3ubuntu3.1 [Not candidate version]
ocaml-base-nox 4.01.0-3ubuntu3 [Not candidate version]
有助于在安装该软件包方面取得进展的答案可能会有所帮助。否则，一个揭示我如何得到认识的 opam 安装实例可能有帮助。如您所见，该安装实际上有效：
vagrant@vagrant-ubuntu-trusty-64:~/projectfolder$ opam list
# Installed packages for system:
base-bigarray base Bigarray library distributed with the OCaml compiler
base-threads base Threads library distributed with the OCaml compiler
base-unix base Unix library distributed with the OCaml compiler
conf-m4 1 Virtual package relying on m4
ocamlfind 1.7.3 A library manager for OCaml
如您所见，我能够通过opam成功安装ocamlfind。
有趣的是，我的make命令似乎无法识别 ocamlfind 我在安装时添加到环境中 opam：
/path/to/some/folder/which/is/super/secret -O2 -d acommand file.f
[Error] Critical: Error starting ocamlopt process: Cannot run program
"ocamlfind" (in directory
"/path/to/some/folder/."): error=2, No such file
or directory (Cannot run program "ocamlfind" (in directory
"/path/to/some/folder/."): error=2, No such file
or directory)
make: *** [some/folder/timestamp] Error 113