Hello,

I'd like to finally learn some functional programming. I thought Ocaml might be
a good choice because it also has imperative features, so transition to a
functional language like Ocaml is probably smoother than, say Haskell.

I started with the Ocaml tutorial, but I learn best with real problems (I'd
like to translate a few of my Python scripts to Ocaml), so I need things from
the standard library. In particular, I need the Unix module. And here I've hit
a problem:

gerhard@lilith:~ > ocaml
Objective Caml version 3.02

# Sys.os_type;;
- : string = "Unix"
# Unix.getpid;;
Reference to undefined global `Unix'
#

I can use the Sys module, but whenever I try to use stuff from the Unix module,
I get the error message above. It must be something obvious I am missing. But
what?

Thanks,

Gerhard
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