From 84878c923ccef2d5c515694c4b8eda485ab7079e Mon Sep 17 00:00:00 2001
From: Austin Seipp <aseipp@pobox.com>
Date: Fri, 28 Feb 2020 21:03:06 -0600
Subject: [PATCH] incrtcl: export ITCL_LIBRARY for downstream users

Signed-off-by: Austin Seipp <aseipp@pobox.com>
---
 pkgs/development/libraries/incrtcl/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/incrtcl/default.nix b/pkgs/development/libraries/incrtcl/default.nix
index a8a714067f4b..614a8f048aa5 100644
--- a/pkgs/development/libraries/incrtcl/default.nix
+++ b/pkgs/development/libraries/incrtcl/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, tcl }:
+{ stdenv, fetchurl, writeText, tcl }:
 
 stdenv.mkDerivation rec {
   pname = "incrtcl";
@@ -27,6 +27,10 @@ stdenv.mkDerivation rec {
     rmdir $out/lib/itcl${version}
   '';
 
+  setupHook = writeText "setup-hook.sh" ''
+    export ITCL_LIBRARY=@out@/lib
+  '';
+
   outputs = [ "out" "dev" "man" ];
 
   meta = with stdenv.lib; {