> 
> What about "camlp4"/"camlp5" ? At least it will allow to make the
> difference between the two.
> 

Hi,

I think that distinction should be private to the META file, without being
visible and exported into userland (I don't see a good reason why the user
of a syntax extension should care if it is implemented with camlp4 or camlp5).
The "requires" attribute of the META file could be used to inform findlib or
Ocamlbuild of which preprocessor to use.

Cheers,
Dario



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