hg clone https://bitbucket.org/camlspotter/compiler-libs-hack
+Note that the code and compiler-libs are highly dependent on OCaml 4.00.0 compiler internals. It is unlikely that it will work with later versions of OCaml.
It contains the full source tree of the official OCaml 4.00.0, but it is attached only for the copyright requirements. We only need few files of it. And of course, you must have OCaml 4.00.0 installed. ``tools/untypeast.ml`` of OCaml 4.00.0 has a small bug, but it is already fixed in this repo and the latest OCaml development version.