From b45c06fde8b5ff9f09c488738097a1514e95fa4b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sandro=20J=C3=A4ckel?= <sandro.jaeckel@gmail.com>
Date: Mon, 15 Mar 2021 01:40:00 +0100
Subject: [PATCH] cpython: allow $out reference again

This regression got introduced with 738746a34b675297624338ab9aa3adb3d3cd4cf6
---
 pkgs/development/interpreters/python/cpython/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/interpreters/python/cpython/default.nix b/pkgs/development/interpreters/python/cpython/default.nix
index fdc60b44bfb..72b47b7afd3 100644
--- a/pkgs/development/interpreters/python/cpython/default.nix
+++ b/pkgs/development/interpreters/python/cpython/default.nix
@@ -330,6 +330,7 @@ in with passthru; stdenv.mkDerivation {
   postInstall = let
     # References *not* to nuke from (sys)config files
     keep-references = concatMapStringsSep " " (val: "-e ${val}") ([
+      (placeholder "out")
     ] ++ optionals tzdataSupport [
       tzdata
     ]);