From f01b25ee6d8397d1b98327586638dcd4d33c60b0 Mon Sep 17 00:00:00 2001
From: Mario Rodas <marsam@users.noreply.github.com>
Date: Mon, 2 Mar 2020 04:20:00 -0500
Subject: [PATCH] ocamlPackages.ocamlnet: disable for Ocaml<4.02

---
 pkgs/development/ocaml-modules/ocamlnet/default.nix | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/ocaml-modules/ocamlnet/default.nix b/pkgs/development/ocaml-modules/ocamlnet/default.nix
index 493ec7f3f51..7d9a0573db7 100644
--- a/pkgs/development/ocaml-modules/ocamlnet/default.nix
+++ b/pkgs/development/ocaml-modules/ocamlnet/default.nix
@@ -2,10 +2,13 @@
 , gnutls, nettle
 }:
 
-let version = "4.1.7"; in
+if stdenv.lib.versionOlder ocaml.version "4.02"
+then throw "ocamlnet is not available for OCaml ${ocaml.version}"
+else
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "ocaml${ocaml.version}-ocamlnet-${version}";
+  version = "4.1.7";
 
   src = fetchurl {
     url = "http://download.camlcity.org/download/ocamlnet-${version}.tar.gz";