Once your virtual Linux box is set up, you can follow the opam Linux install instructions. There are many good tutorials on how to build a Linux VM, here is one of them. Option 2 is to set up a Linux VM on your Windows box, and then set up a Linux install of OCaml within the VM.Note that your Ubuntu needs the C compiler and tools for the opam install to work the following Linux shell command will get you those: sudo apt install make m4 gcc unzip.If you are running a recent Windows install, we recommend installing WSL 2 which once you have set up will allow you to follow the Linux Ubuntu install instructions above to get opam.the OCaml toolchain is unfortunately not good in straight Windows. Make sure to do the opam update step first or your install won’t know that 4.13.1 even exists. If you already have an earlier version of OCaml installed via opam, start on step 2. If you are using zsh on macs, add line eval `opam env` instead to your ~/.zshrc file. Also add the very same line, eval $(opam env), to your ~/.bash_profile or ~/.profile or ~/.bashrc shell init file (add to the first one that exists already) as you would need to do that in every new terminal window otherwise.eval $(opam env) to let your shell know where the OPAM files are (use eval `opam env` instead if you are using zsh on a Mac) and.opam switch create 4.13.1 (this will take awhile) to build OCaml version 4.13.1 (the initial install is usually a slightly outdated version also, if you already had an OPAM install you need to opam update before this switch to make sure OPAM is aware of the latest version).
Mac with Homebrew (make sure you first do a brew update before this): brew install gpatch brew install opam.
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