{ fetchurl, lib, stdenv, ocaml, makeWrapper, ncurses }:

let version = "0.92"; in
stdenv.mkDerivation {
  pname = "megam";
  inherit version;

  src = fetchurl {
    url = "http://hal3.name/megam/megam_src.tgz";
    sha256 = "dc0e9f59ff8513449fe3bd40b260141f89c88a4edf6ddc8b8a394c758e49724e";
  };

  patches = [ ./ocaml-includes.patch ./ocaml-3.12.patch ];

  postPatch = ''
    # Deprecated in ocaml 3.10 https://github.com/ocaml/ocaml/commit/f6190f3d0c49c5220d443ee8d03ca5072d68aa87
    # Deprecated in ocaml 3.08 https://github.com/ocaml/ocaml/commit/0c7aecb88dc696f66f49f3bed54a037361a26b8d
    substituteInPlace fastdot_c.c --replace copy_double caml_copy_double --replace Bigarray_val Caml_ba_array_val --replace caml_bigarray caml_ba_array
    # They were already deprecated in 3.12 https://v2.ocaml.org/releases/3.12/htmlman/libref/Array.html
    substituteInPlace abffs.ml main.ml --replace create_matrix make_matrix
    substituteInPlace intHashtbl.ml --replace Array.create Array.make
  '';
  strictDeps = true;

  nativeBuildInputs = [ makeWrapper ocaml ];

  buildInputs = [ ncurses ];

  makeFlags = [
    "CAML_INCLUDES=${ocaml}/lib/ocaml/caml"
    ("WITHBIGARRAY=" + lib.optionalString (lib.versionOlder ocaml.version "4.08.0") "bigarray.cma")
  ];

  # see https://bugzilla.redhat.com/show_bug.cgi?id=435559
  dontStrip = true;

  installPhase = ''
    mkdir -pv $out/bin
    cp -Rv megam $out/bin
  '';


  meta = {
    description = "MEGA Model Optimization Package";

    longDescription =
      ''  The software here is an implementation of maximum likelihood
          and maximum a posterior optimization of the parameters of
          these models.  The algorithms used are much more efficient
          than the iterative scaling techniques used in almost every
          other maxent package out there.  '';

    homepage = "http://www.umiacs.umd.edu/~hal/megam";

    license = "non-commercial";

    maintainers = [ ];
    platforms = lib.platforms.unix;
  };
}