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-rw-r--r--pkgs/development/libraries/incrtcl/default.nix6
1 files changed, 5 insertions, 1 deletions
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; {