From d7a2884e0d33a2a3c31a2b65a20cf4c488aae562 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Thu, 24 Jul 2014 15:06:45 -0500
Subject: [PATCH] haskell-ghc-mod: fix to prevent Emacs from hanging

---
 pkgs/development/libraries/haskell/ghc-mod/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/libraries/haskell/ghc-mod/default.nix b/pkgs/development/libraries/haskell/ghc-mod/default.nix
index b5ed78d7212f..3fd12bcfc559 100644
--- a/pkgs/development/libraries/haskell/ghc-mod/default.nix
+++ b/pkgs/development/libraries/haskell/ghc-mod/default.nix
@@ -23,6 +23,7 @@ cabal.mkDerivation (self: {
   configureFlags = "--datasubdir=${self.pname}-${self.version}";
   postInstall = ''
     cd $out/share/$pname-$version
+    sed -i -e 's/"-b" "\\n" "-l"/"-l" "-b" "\\"\\\\n\\""/' ghc-process.el
     make
     rm Makefile
     cd ..