From 2fb7cd664e4fe2f25ae752bddda76a9d7a7471a7 Mon Sep 17 00:00:00 2001
From: Timo Kaufmann <timokau@zoho.com>
Date: Tue, 28 Sep 2021 18:26:33 +0200
Subject: [PATCH] tcl.mkTclDerivation: fix exec prefix

Shell variables are not expanded, so the old value was just the literal
string `${out}`.

Fixes #139566
---
 pkgs/development/interpreters/tcl/mk-tcl-derivation.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/interpreters/tcl/mk-tcl-derivation.nix b/pkgs/development/interpreters/tcl/mk-tcl-derivation.nix
index f3d34f13c688..0e44eb358593 100644
--- a/pkgs/development/interpreters/tcl/mk-tcl-derivation.nix
+++ b/pkgs/development/interpreters/tcl/mk-tcl-derivation.nix
@@ -32,7 +32,7 @@ let
   defaultTclPkgConfigureFlags = [
     "--with-tcl=${tcl}/lib"
     "--with-tclinclude=${tcl}/include"
-    "--exec-prefix=\${out}"
+    "--exec-prefix=${placeholder "out"}"
   ];
 
   self = (stdenv.mkDerivation ((builtins.removeAttrs attrs [