From f41ac80d74d38321e60f8bc9efb431f498e5e31d Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Mon, 10 Dec 2018 19:59:40 +0000
Subject: [PATCH] ocaml-ng.ocamlPackages_4_01_0.cstruct-unix: fix evaluation

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

diff --git a/pkgs/development/ocaml-modules/cstruct/unix.nix b/pkgs/development/ocaml-modules/cstruct/unix.nix
index fb7612b5f05..604ad4fb083 100644
--- a/pkgs/development/ocaml-modules/cstruct/unix.nix
+++ b/pkgs/development/ocaml-modules/cstruct/unix.nix
@@ -1,4 +1,8 @@
-{ buildDunePackage, cstruct }:
+{ lib, buildDunePackage, cstruct }:
+
+if !lib.versionAtLeast (cstruct.version or "1") "3"
+then cstruct
+else
 
 buildDunePackage {
 	pname = "cstruct-unix";