From 3cca862a5f4ea8166d5b2968370cb49532e06ffc Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Mon, 10 Dec 2018 19:59:32 +0000
Subject: [PATCH] ocaml-ng.ocamlPackages_4_01_0.cstruct-lwt: fix evaluation

---
 pkgs/development/ocaml-modules/cstruct/lwt.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/ocaml-modules/cstruct/lwt.nix b/pkgs/development/ocaml-modules/cstruct/lwt.nix
index fc6218389662..5a10d7cae48d 100644
--- a/pkgs/development/ocaml-modules/cstruct/lwt.nix
+++ b/pkgs/development/ocaml-modules/cstruct/lwt.nix
@@ -1,4 +1,8 @@
-{ buildDunePackage, cstruct, lwt }:
+{ lib, buildDunePackage, cstruct, lwt }:
+
+if !lib.versionAtLeast (cstruct.version or "1") "3"
+then cstruct
+else
 
 buildDunePackage {
 	pname = "cstruct-lwt";