From 03fc4992af530d68ebad33c9f746adda00a75505 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Thu, 2 Dec 2021 13:37:21 +0100
Subject: [PATCH] prooftree: use OCaml 4.12

---
 pkgs/top-level/all-packages.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2fd3683e3c6d..a6e7ae6b5245 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -32503,7 +32503,9 @@ with pkgs;
 
   libpoly = callPackage ../applications/science/logic/poly {};
 
-  prooftree = callPackage  ../applications/science/logic/prooftree {};
+  prooftree = callPackage  ../applications/science/logic/prooftree {
+    ocamlPackages = ocaml-ng.ocamlPackages_4_12;
+  };
 
   prover9 = callPackage ../applications/science/logic/prover9 { };