[Caml-list] Installing 4.02

[Mick Sulley <mick@sulley.info>]

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 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;

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`

How do I get to 4.02?

Thanks
Mick