From 34a91b79220cf54bce20db52cf2d5775ccc5e611 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Tue, 2 Jan 2018 11:37:54 -0500
Subject: [PATCH] haskell: Fix depending on libs with internal libs on darwin.

Thanks to @hamishmack for the pointer.

Fixes #33149.
---
 pkgs/development/haskell-modules/generic-builder.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index c633310a37a..e4ae24f74fa 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -243,7 +243,7 @@ stdenv.mkDerivation ({
     # libraries) from all the dependencies.
     local dynamicLinksDir="$out/lib/links"
     mkdir -p $dynamicLinksDir
-    for d in $(grep dynamic-library-dirs "$packageConfDir/"*|awk '{print $2}'); do
+    for d in $(grep dynamic-library-dirs "$packageConfDir/"*|awk '{print $2}'|sort -u); do
       ln -s "$d/"*.dylib $dynamicLinksDir
     done
     # Edit the local package DB to reference the links directory.