Can't compile with cairo2

Hello,

I just installed cairo2 from opam, but when I try to compile some code I 
got a link error :

> $ ocamlfind ocamlc -package cairo2 test.ml
> File "test.ml", line 1:
> Error: Error while linking test.cmo:
> The external function `caml_cairo_image_surface_create' is not available

Is there an external dependency required ? (package libcairo2 and 
libcairo2-dev are installed)

Thanks !