Yes in the configure script cmt is enabled only for
certain ocaml versions.
The problem is that the caml AST format (stored in the .cmt) has changed in every versions … I would have hoped for a more
stable type.

#TODO: not yet ported to 4.02
if($ocaml_version >= 4000 && $ocaml_version < 4020) {
    $cmt=1;


> On Jan 23, 2015, at 6:52 AM, Arnaud Spiwack <aspiwack@lix.polytechnique.fr> wrote:
> 
> No, I actually just downloaded the sources and compiled them. Maybe it's because I compiled pfff with ocaml 4.02.1, I notice there isn't a package for pfff in the corresponding opam switch. I'll have to try other versions.
> 
> On 23 January 2015 at 15:26, Daniel Bünzli <daniel.buenzli@erratique.ch <mailto:daniel.buenzli@erratique.ch>> wrote:
> 
> 
> Le vendredi, 23 janvier 2015 à 15:02, Arnaud Spiwack a écrit :
> 
> > I'm confused. I've got a version of pfff compiled from today's github version. I get the following:
> >
> > $ codegraph -lang cmt -build .
> > Fatal error: exception Failure("language not supported: cmt")
> 
> Did you get it by pinning opam ? This may explain:
> 
> https://github.com/ocaml/opam-repository/blob/master/packages/pfff/pfff.0.27.3/opam#L5 <https://github.com/ocaml/opam-repository/blob/master/packages/pfff/pfff.0.27.3/opam#L5>
> 
> Best,
> 
> Daniel
> 
> 
> 
>