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Howto perform a fresh install of OCaml with OPAM
Rédigé le 03/20/17 - 04:03 PM

 I recently had to set up a fresh installation of OCaml, using OPAM, in my home directory on a Linux machine. I followed the hints given at https://ocaml.org/docs/install.html for installing OPAM, and used a simple OPAM command to execute to install OCaml.

Here is the summary of my installation, in case you want to do the same by yourself. Note that this procedure:

  • does not require special rights (no root, no sudo)
  • assumes that you have a directory named $HOME/bin (if not, create it using the command mkdir $HOME/bin)

1. Make sure there is no command named ocamlc in your PATH variable

 

Execute, in a terminal window:

    type -p ocamlc

If there is no output, go on. If something is printer, then you need to set your PATH variable to a list of directories excluding the directory printed above. For instance:

    export PATH=$HOME/bin:/bin:/usr/bin

 

2. Fetch the binary for OPAM and install it in $HOME/bin

 

    wget https://raw.github.com/ocaml/opam/master/shell/opam_installer.sh -O - | sh -s $HOME/bin

 

If this does not work:

  1. find the correct binary at https://github.com/ocaml/opam/releases/tag/1.2.2
  2. download it into $HOME/bin
  3. make it executable (chmod a+x)
  4. and rename (or link) it as opam

3. Then, initialize your OPAM environment and install the (for instalce) 4.04.0 OCaml release

 

    $HOME/bin/opam init --comp=4.04.0

4. Install other OCaml packages

 

For instance:

    $HOME/bin/opam install merlin tuareg ocp-indent

5. Check your shell environment

 

OPAM has asked for the right to modify your shell startup file (typically .bashrc). Your .bashrc file should now contain something like:

    eval $(opam config env)

This is important: the OCaml commands are now located into $HOME/.opam/4.04.0/bin, and this directory should now occur in your PATH variable/.

 

To are now ready to use OCaml in a new shell terminal. Enjoy!

 

 

Auteur: Michel Mauny

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