diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 9f7a18fa2dac..1324b8b979bb 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -57,6 +57,15 @@ self: super: {
   # Link the proper version.
   zeromq4-haskell = super.zeromq4-haskell.override { zeromq = pkgs.zeromq4; };
 
+  WordNet = pkgs.stdenv.lib.overrideDerivation super.WordNet (drv: {
+    src = ~/.dev/Haskell/WordNet-1.1.0;
+    postPatch = (drv.postPatch or "") + ''
+      substituteInPlace NLP/WordNet/Consts.hs \
+        --replace /usr/local/WordNet-2.0 ${pkgs.wordnet} \
+        --replace 'defined (MAC)' 0
+    '';
+  });
+
   # This package needs a little help compiling properly on Darwin. Furthermore,
   # Stackage compiles git-annex without the Assistant, supposedly because not
   # all required dependencies are part of Stackage. To comply with Stackage, we
diff --git a/pkgs/stdenv/default.nix b/pkgs/stdenv/default.nix
index 71bdc3e8f829..da93229ce94c 100644
--- a/pkgs/stdenv/default.nix
+++ b/pkgs/stdenv/default.nix
@@ -54,7 +54,7 @@ rec {
     if system == "armv7l-linux" then stdenvLinux else
     if system == "mips64el-linux" then stdenvLinux else
     if system == "powerpc-linux" then /* stdenvLinux */ stdenvNative else
-    if system == "x86_64-darwin" then stdenvDarwin else
+    if system == "x86_64-darwin" then stdenvDarwinPure else
     if system == "x86_64-solaris" then stdenvNix else
     if system == "i686-cygwin" then stdenvNative else
     if system == "x86_64-cygwin" then stdenvNative else