I've been using
  eval $(opam config env)
myself. Maybe this would be less error-prone to document?
(Is it less portable to other shells?)

On Sun, Mar 6, 2016 at 6:23 AM, Hendrik Boom <hendrik@topoi.pooq.com> wrote:

> On Sun, Mar 06, 2016 at 10:22:21AM +0000, Mick Sulley wrote:
> > Hi,
> >
> > Totally new to OCaml.  I am trying to install OCaml version 4.02 or
> > higher on a Raspberry Pi running Raspbian.  I have OPAM and OCaml
> > 4.01 installed but if I enter
> > opam switch 4.02.1
> > I get
> > pi@raspberrypi:~/geneweb $ opam switch 4.02.1
> > # To setup the new switch in the current shell, you need to run:
> > eval `opam config env`
> >
>
> I've just struggled with this stuff on a 32-bit x86 Linux.
> The opam switch command alters the dotfiles (things like .bashrd)
> so that the next time you log in or start a shell, the environment
> variables are set to the new switch.
>
> opam config env
>
> generates the list of command you saw below:
>
> > I then try -
> > pi@raspberrypi:~/geneweb $ eval 'opam config env'
> > CAML_LD_LIBRARY_PATH="/home/pi/.opam/4.02.1/lib/stublibs"; export
> > CAML_LD_LIBRARY_PATH;
> > MANPATH=":/home/pi/.opam/4.02.1/man"; export MANPATH;
> > PERL5LIB="/home/pi/.opam/4.02.1/lib/perl5"; export PERL5LIB;
> > OCAML_TOPLEVEL_PATH="/home/pi/.opam/4.02.1/lib/toplevel"; export
> > OCAML_TOPLEVEL_PATH;
> >
> PATH="/home/pi/.opam/4.02.1/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games";
> > export PATH;
>
> The eval command
>
> > eval `opam config env`
>
> is *supposed* to get them executed in the present shell.
> If it doesn't work, your eval isn't the same as mine, and I suggest you
> log in again, or start a new shell.
>
> -- hendrik
>
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