opam의 Ocaml 프로젝트를 사용하는 설정 방법

brew install opam

opam init

Do you want opam to modify ~/.zshrc? [N/y/f]
(default is 'no', use 'f' to choose a different file)

A hook can be added to opam's init scripts to ensure that the shell remains in sync with the opam environment when they are loaded. Set that up? [y/N]

eval $(opam env)

ocaml --version
which ocaml      # => `~/.opam/default/bin/ocaml`になっているはず

opam switch list-available

# cd /path/to/your_project して
opam switch create . ocaml-base-compiler.4.11.1

eval $(opam env)
ocaml --version
which ocaml      # => `/path/to/your_project/_opam/bin/ocaml`になっているはず

# cd /path/to/your_project して
touch ${your_project_name}.opam

opam-version: "2.0"  # => opam自体のバージョンが2以上でも"2.0"と書いておけばOK
depends: [           # => 必要なパッケージを記載
  "merlin"
  "dune" {= "2.7.1"} # => バージョン指定したい場合の書き方
]

# cd /path/to/your_project して
opam install . --deps-only