From b0d7d60fd4afb938fa92294c012f8ae2e5c80294 Mon Sep 17 00:00:00 2001
From: Florent Becker <Florent.Becker@ens-lyon.org>
Date: Thu, 16 Feb 2017 11:55:47 +0100
Subject: [PATCH] prooftree: force ocaml 4.01

---
 pkgs/top-level/ocaml-packages.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 750fb7324a4..aab1f31d68c 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -723,7 +723,10 @@ let
       camlp5 = camlp5_transitional;
     };
 
-    prooftree = callPackage ../applications/science/logic/prooftree {
+    prooftree =
+      if lib.versionOlder "4.01" ocaml.version
+      then null
+      else callPackage ../applications/science/logic/prooftree {
       camlp5 = camlp5_transitional;
     };
   };