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From: Francois Berenger <berenger@riken.jp>
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Subject: Re: [Caml-list] Old and new OCaml installed on same machine?

On 02/18/2013 04:22 PM, oliver wrote:
> Hello,
>
> any ideas on how to manage multiple OCaml-installations
> on one machine, without running into trouble?
>
> I have 3.11.2 here on my old Ubuntu box.
> I built OCaml 4.00, but stopped before the "make install",
> because on a target system (a server providing my web stuff)
> there also is 3.11.2 installed (older Debian system), and I'm
> not root at that system.
>
> But I want to compile my code there also.
> So I may need to develop in two branches for a while
> and do merges.
>
> When I remove my 3.11.2, the testing would need me to work
> on the remote machine, when testing the old-branch (the merges).
> Possible, but more effort (and network delays are annoying).
>
> Can more than one OCaml be installed and used in an easy way?
> Or should I forget this issue because of "mission impossible"
> or because of "that needs too much effort"?

I think you are looking for the opam -switch option.
It allows to "jump" from one version to another.

> (I use OCamlMakefile for building my stuff.)
>
> Any ideas on that?
>
>
> Ciao,
>     Oliver
>