{ stdenv, lib, fetchFromGitHub, fetchpatch, ocaml, findlib, withStatic ? false }:

stdenv.mkDerivation (rec {
  version = "1.1";
  pname = "ocaml${ocaml.version}-num";
  src = fetchFromGitHub {
    owner = "ocaml";
    repo = "num";
    rev = "v${version}";
    sha256 = "0a4mhxgs5hi81d227aygjx35696314swas0vzy3ig809jb7zq4h0";
  };

  patches = [ (fetchpatch {
      url = "https://github.com/ocaml/num/commit/6d4c6d476c061298e6385e8a0864f083194b9307.patch";
      sha256 = "18zlvb5n327q8y3c52js5dvyy29ssld1l53jqng8m9w1k24ypi0b";
    })
  ] ++ lib.optional withStatic ./enable-static.patch;

  nativeBuildInputs = [ ocaml findlib ];

  strictDeps = true;

  createFindlibDestdir = true;

  meta = {
    description = "Legacy Num library for arbitrary-precision integer and rational arithmetic";
    license = lib.licenses.lgpl21;
    inherit (ocaml.meta) platforms;
    inherit (src.meta) homepage;
  };
} // (lib.optionalAttrs (lib.versions.majorMinor ocaml.version == "4.06") {
    env.NIX_CFLAGS_COMPILE = "-fcommon";
  })
)