From 475c8bfb7d13de76d6e0ff1c052ad95b2754d7e2 Mon Sep 17 00:00:00 2001
From: Christian Gram Kalhauge <christian@kalhauge.dk>
Date: Wed, 20 Jul 2016 14:21:53 +0200
Subject: [PATCH] Fix DLYD problem with haskell libraries on Darwin

This commit fixes a problem that occurs with externally linked haskell
libraries on Darwin. It does this by adding the libraries to the
--extra-lib-dirs flag and the DYLD_LIBRARY_PATH environment variable.
---
 pkgs/development/haskell-modules/generic-builder.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 72110227140..2bcf6ee854f 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -193,6 +193,9 @@ stdenv.mkDerivation ({
       fi
       if [ -d "$p/lib" ]; then
         configureFlags+=" --extra-lib-dirs=$p/lib"
+        if [[ ${ if stdenv.isDarwin then "yes" else "no"} = "yes" ]]; then
+          export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:$p/lib;
+        fi
       fi
     done
     ${ghcCommand}-pkg --${packageDbFlag}="$packageConfDir" recache