CentOS Question posted in
The official documentation can be found here.

How to use unison across OS X and linux? Fatal error due to ocaml version – CentOS

I am trying to use unison from my OS X machine to a linux box running: CentOS release 6.10 (Final)

I had to make a static compilation of unison 2.51 for the linux box. This version is:

unison version 2.51.2 (ocaml 4.02.3)

On the OS X machine I used “brew install unison”. This gives me:

unison version 2.51.2 (ocaml 4.08.1)

If I try to now use unison I get:

Fatal error during unmarshaling (input_value: ill-formed message), possibly because client and server have been compiled with differentversions of the OCaml compiler.

What can I do to get unison to work?

Tags:

3

Answers


  1. 0

    You will have to compile ocaml and unison from source on your linux box.

    Ocaml: You can find ocaml 4.08 on https://caml.inria.fr/pub/distrib/. The instructions for compiling are in the readme.

    Unison: From https://github.com/bcpierce00/unison/commits/master, you will see that the commit acfa105 is a verified commit compatible with Ocaml 4.08.1. Download this commit and run make.

    I ran into the exact same issue and was able to resolve it using the above steps.

    Login or Signup to reply.
  2. 0

    I was running docker with a few containers and using docker-sync to keep things in sync with my local files on my Mac when i hit this issue.

    My mac had the following installed:

    unison -version
unison version 2.51.2 (ocaml 4.06.1)

    My web-sync docker container used:

    unison -version
unison version 2.51.2 (ocaml 4.08.1)

    The solution that worked for me was:

    brew uninstall unison && brew install unison
    Login or Signup to reply.
  3. 0

    Similar problem – I could resolve it by installing identical deb file for unsion on both PC – and deleting some files. In fact I decided to install the deb-File I have on my Laptop also on the PC, where I have a different distro. This has to be done bypassing apt/synaptics, using dpkg. – And same has to be done for unsion-gtk. So what saved me was downloading those both deb-Files, I have allready installed on my Laptop. In my case this were unison_2.48.4-1+b1_amd64.deb and unison-gtk_2.48.4-1+b1_amd64.deb . I installed them in a terminal with
    sudo dpkg -i unison_2.48.4-1+b1_amd64.deb
    sudo dpkg -i unison-gtk_2.48.4-1+b1_amd64.deb

    On both, Laptop and PC, i did remove in the hidden folder ".unison" (in my home directory) all files, with a filename starting with "fp…", that are created after I had updated laptop A to a newer version of ubuntu.

    To make sure my PC wont "upgrade" unison and unison-gtk I created a file with filename "unison" in the folder /etc/apt/preferences.d/ an wrote this text into my file "unison":

     Package: unison
 Pin: version 2.48.4-1+b1
 Pin-Priority: 1000

 Package: unison-gtk
 Pin: version 2.48.4-1+b1
 Pin-Priority: 1000

    Now. everything works fine.
    More background info to that hack: https://bugs.launchpad.net/ubuntu/+source/unison/+bug/1868502

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search