From b3411342a41518fc80f37067e26f9da30400a397 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Thu, 8 Nov 2018 17:17:43 +0000
Subject: [PATCH] ocamlPackages.zmq: fix build with non-default OCaml

---
 .../development/ocaml-modules/zmq/default.nix | 23 +++++++++++++++----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/pkgs/development/ocaml-modules/zmq/default.nix b/pkgs/development/ocaml-modules/zmq/default.nix
index fe6a17e876b6..bb16ac46f991 100644
--- a/pkgs/development/ocaml-modules/zmq/default.nix
+++ b/pkgs/development/ocaml-modules/zmq/default.nix
@@ -1,9 +1,16 @@
-{ stdenv, fetchFromGitHub, buildDunePackage, czmq, stdint }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, czmq, stdint }:
 
-buildDunePackage rec {
-  pname = "zmq";
+if !stdenv.lib.versionAtLeast ocaml.version "4.03"
+then throw "zmq is not available for OCaml ${ocaml.version}"
+else
+
+let __dune = dune; in
+let dune = __dune.override { ocamlPackages = { inherit ocaml findlib; }; };
+in
+
+stdenv.mkDerivation rec {
+  name = "ocaml${ocaml.version}-zmq-${version}";
   version = "20180726";
-
   src = fetchFromGitHub {
     owner = "issuu";
     repo = "ocaml-zmq";
@@ -15,13 +22,19 @@ buildDunePackage rec {
     ./ocaml-zmq-issue43.patch
   ];
 
-  buildInputs = [ czmq ];
+  buildInputs = [ ocaml findlib dune czmq ];
+
   propagatedBuildInputs = [ stdint ];
 
+  buildPhase = "dune build -p zmq";
+
+  inherit (dune) installPhase;
+
   meta = with stdenv.lib; {
     description = "ZeroMQ bindings for OCaml";
     license     = licenses.mit;
     maintainers = with maintainers; [ akavel ];
     inherit (src.meta) homepage;
+    inherit (ocaml.meta) platforms;
   };
 }