Excerpts from Andres Varon's message of Fri Nov 28 16:50:14 +0100 2008:
> Hello,
> 
> On Nov 25, 2008, at 12:09 PM, Damien Doligez wrote:
> 
> > Dear OCaml users,
> >
> > We are closing in on version 3.11.0.  A Release Candidate is now  
> > available.
> > If there are no show-stoppers in this RC, then 3.11.0 will be  
> > officially
> > released next week.
> >
> > The release candidate is available here:
> > < http://caml.inria.fr/pub/distrib/ocaml-3.11/ >
> > (look for 3.11.0+rc1)
> 
> I have a question about the behavior of camlp4orf (and family) in  
> 3.11.0. Now with the availability of native dynlink, it seems like  
> camlp4orf and camlp4orf.opt can load external modules inside the core.  
> If one looks at their respective help:
> 
> <file>.(cmo|cma) Load this module inside the Camlp4 core
> <file>.cmx       Load this module inside the Camlp4 core
> 
> This is a feature I've been looking for to speedup compilation times.  
> However, if I try the native version, here is what I get:
> 
> samson:src andres$ camlp4orf.opt poyExtension.cmx
> Error: don't know what to do with poyExtension.cmx
> Use option -help for usage
> 
> Is the usage different for the camlp4*.opt preprocessors?

You should try with .cmxs files.

-- 
Nicolas Pouillard aka Ertai