From 614544b4393f19a75d84ad04885b522f3a215858 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Wed, 4 Dec 2013 18:26:48 +0100
Subject: [PATCH] haskell-src: clean out the obsolete happy parser that's
 included in the distribution tarball

---
 pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix b/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix
index 1dbbbec550a..cfaabe7f6b0 100644
--- a/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix
+++ b/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix
@@ -6,6 +6,7 @@ cabal.mkDerivation (self: {
   sha256 = "1ay3i2sbrp0pzg6fagg8gqrwq5lcnm5jb5sr11frbk274a82cdwz";
   buildDepends = [ syb ];
   buildTools = [ happy ];
+  preConfigure = "runhaskell Setup.hs clean";
   meta = {
     description = "Support for manipulating Haskell source code";
     license = self.stdenv.lib.licenses.bsd3;