From 5e786dedc1b99f68542c0ec8824a87a8d544aaa5 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Mon, 10 Dec 2018 19:59:45 +0000
Subject: [PATCH] ocaml-ng.ocamlPackages_4_01_0.ppx_cstruct: fix evaluation

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

diff --git a/pkgs/development/ocaml-modules/cstruct/ppx.nix b/pkgs/development/ocaml-modules/cstruct/ppx.nix
index 5f4130dc23f..78600b78306 100644
--- a/pkgs/development/ocaml-modules/cstruct/ppx.nix
+++ b/pkgs/development/ocaml-modules/cstruct/ppx.nix
@@ -1,4 +1,8 @@
-{ buildDunePackage, cstruct, ppx_tools_versioned }:
+{ lib, buildDunePackage, cstruct, ppx_tools_versioned }:
+
+if !lib.versionAtLeast (cstruct.version or "1") "3"
+then cstruct
+else
 
 buildDunePackage {
 	pname = "ppx_cstruct";