"Error during linking" for a Java compiler written in Ocaml

I have found a source of Java compiler writ开发者_StackOverflowten in Ocaml which should work.

But when I do make, it finished with an error:

unzip.o: In function `camlUnzip__59':
(.data+0x540): undefined reference to `camlzip_deflateEnd'
unzip.o: In function `camlUnzip__59':
(.data+0x544): undefined reference to `camlzip_deflate'
unzip.o: In function `camlUnzip__59':
(.data+0x548): undefined reference to `camlzip_deflateInit'
collect2: ld returned 1 exit status
File "caml_startup", line 1, characters 0-1:
Error: Error during linking
make: *** [javacx] Error 2

It is odd that the file "caml_startup" even does not exist in the folder. Could anyone help? Thank you very much.

caml_startup is part of the OCaml runtime.

The project's website mentions that it works with OCaml 3.09, which is quite old. It worked for me with 3.10 (which is still quite old; latest release is 3.12) - maybe it just doesn't work with more recent versions.

However, as a first guess, I would try simply deleting these definitions from unzip.ml - they are never called, and declare external routines which are not actually implemented (whereas other external routines in unzip.ml are implemented in zlib.c):

external deflate_init: int -> bool -> stream = "camlzip_deflateInit"
external deflate:
  stream -> string -> int -> int -> string -> int -> int -> flush_command
         -> bool * int * int
  = "camlzip_deflate_bytecode" "camlzip_deflate"
external deflate_end: stream -> unit = "camlzip_deflateEnd"