Dear all, I have tried to use json-static in OCaml 3.11, but met the annoying problem: Reference to undefined global `Dynlink' As Camlp4 3.11 requires explicit load of dynlink, so I tried ocamlfind ocamlc -package dynlink, json-static -syntax camlp4o -o test test.ml -linkpkg But failed with the same error. Thanks for any help. Conglun