From b75cb8a97ddaa2fa3b9c76ef97d69157273f83a7 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Sat, 19 Dec 2020 18:33:55 +0100
Subject: [PATCH] ocamlPackages.ppxlib: fix evaluation

---
 pkgs/development/ocaml-modules/ppxlib/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/ocaml-modules/ppxlib/default.nix b/pkgs/development/ocaml-modules/ppxlib/default.nix
index 822c30daf26..d5b09b1ddc2 100644
--- a/pkgs/development/ocaml-modules/ppxlib/default.nix
+++ b/pkgs/development/ocaml-modules/ppxlib/default.nix
@@ -21,7 +21,7 @@ let param = {
 
 if param ? max_version && lib.versionAtLeast ocaml.version param.max_version
 || param ? min_version && !lib.versionAtLeast ocaml.version param.min_version
-then throw "ppxlib-${param.version} is not available for OCaml ${ocaml.version}"
+then throw "ppxlib-${version} is not available for OCaml ${ocaml.version}"
 else
 
 buildDunePackage rec {