From 0361ae22304698390acf0202f2e85034f4268c4a Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Fri, 18 Oct 2019 06:20:17 +0000
Subject: [PATCH] =?UTF-8?q?ocamlPackages.camlp4:=20fix=20evaluation=20for?=
 =?UTF-8?q?=20OCaml=20=E2=89=A5=204.09?=
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---
 pkgs/development/tools/ocaml/camlp4/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/tools/ocaml/camlp4/default.nix b/pkgs/development/tools/ocaml/camlp4/default.nix
index a7ef6d7bedd..6b471560fa9 100644
--- a/pkgs/development/tools/ocaml/camlp4/default.nix
+++ b/pkgs/development/tools/ocaml/camlp4/default.nix
@@ -1,5 +1,9 @@
 { stdenv, fetchzip, which, ocaml, ocamlbuild }:
 
+if stdenv.lib.versionAtLeast ocaml.version "4.09"
+then throw "camlp4 is not available for OCaml ${ocaml.version}"
+else
+
 let param = {
   "4.02" = {
      version = "4.02+6";