Availability of netshm/POSIX shared memory under Ubuntu 9.10

Hi
I'm trying to use ocamlnet to access to POSIX shared memory.

I wrote this little piece of code:

let _ =
    Printf.printf("Test shared memory\n");
    if (Netsys.have_posix_shm () = false) then
        Printf.printf("No POSIX SHM\n")
    else
        (
            Printf.printf("POSIX SHM OK\n");
        )

It is displaying me "No POSIX SHM".

I also tried to run some code like :
    let my_shm_name = `POSIX "my_shm" in
    let sd = Netshm.open_shm my_shm_name [Unix.O_CREAT; Unix.O_RDWR] 0o666
in

The result is an error:
Fatal error: exception Invalid_argument("Netsys.shm_open not available")

I am running this code on a Ubuntu 9.10 64 bits.
This page "
http://manpages.ubuntu.com/manpages/karmic/man7/shm_overview.7.html"
specifies that "POSIX shared memory is supported since Linux 2.4 and glibc
2.2."
I do not see any reason why I obtain this behaviour.

Thanks in advance for your time.
Regards.
Johan Mazel

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