Hi,
Trying to compile batteries (version 20090405 on ocaml 3.11.1),
I get this error:

+ ocamlfind ocamlc -c -g -I src/syntax/pa_strings -I src -I src/core -I 
src/main -I src/libs -I src/core/extlib_threads -I src/core/extlib -I 
src/core/baselib -I src/core/baselib_threads -I src/libs/common -I 
src/libs/camlzip -I src/libs/sexplib -I src/libs/findlib -I 
src/libs/compilers -I src/libs/ocamlnet -I build/optcomp -o 
src/syntax/pa_strings/pa_estring.cmi src/syntax/pa_strings/pa_estring.mli
File "src/syntax/pa_strings/pa_estring.mli", line 12, characters 0-19:
Error: Unbound module Camlp4.PreCast

this line 12 is only:
open Camlp4.PreCast


Does someone have an idea of what could cause this error ?

-- 
Thanks in advance
Florent