ocamlrpcgen no longer recognises command line options

[David MENTRE <dmentre@linux-france.org>]

Hello,

I'm trying to compile my OCaml program under Ubuntu Gutsy. The program
was compiling fine under Ubuntu Feisty. 

Apparently, ocamlrpcgen no longer recognises command line options:

$ ocamlrpcgen -cpp none -int unboxed -hyper int64 -aux net/messages.xdr
Unknown option -cpp.
$ ocamlrpcgen -int unboxed -hyper int64 -aux net/messages.xdr
Unknown option -int.
$ ocamlrpcgen -hyper int64 -aux net/messages.xdrUnknown option -hyper.
Unknown option -hyper.

The Ubuntu Gutsy package is version 2.2.7, which is apparently the same
as the Etch backport[1].

$ which ocamlrpcgen
/usr/bin/ocamlrpcgen
$ dpkg -S /usr/bin/ocamlrpcgen
libocamlnet-ocaml-bin: /usr/bin/ocamlrpcgen
$ apt-cache show libocamlnet-ocaml-bin
[...]
Version: 2.2.7-1

Any idea of the cause of this rather strange issue? How I might fix it?

Is this issue common to all Debian based distribution or specific to
Ubuntu Gutsy? Where should I report the bug? 

Many thanks in advance for any help,
Yours,
david

Footnotes: 
[1]  http://packages.debian.org/libocamlnet-ocaml
etch-backports (libs): OCaml application-level Internet libraries - core runtime libraries
2.2.7-1~bpo40+1 [backports]: i386

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