From 284ea5859b13e40a319785f4dc616a6f1517e691 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Wed, 26 Mar 2014 12:49:46 +0100
Subject: [PATCH] BNFC: fix build with GHC 7.8.1

---
 pkgs/development/tools/haskell/BNFC/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/tools/haskell/BNFC/default.nix b/pkgs/development/tools/haskell/BNFC/default.nix
index 3cb85b86acbd..ebe8d2c3e24c 100644
--- a/pkgs/development/tools/haskell/BNFC/default.nix
+++ b/pkgs/development/tools/haskell/BNFC/default.nix
@@ -1,4 +1,4 @@
-{ cabal, mtl, fetchurl }:
+{ cabal, mtl, fetchurl, alex, happy }:
 
 cabal.mkDerivation (self: {
   pname = "BNFC";
@@ -7,8 +7,10 @@ cabal.mkDerivation (self: {
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ mtl ];
+  buildTools = [ alex happy ];
   patches = [ (fetchurl { url = "https://github.com/BNFC/bnfc/pull/3.patch"; sha256 = "103l04ylzswgxrmpv5zy6dd0jyr96z21mdkpgk1z4prvn8wjl624"; }) ];
   patchFlags = "-p2";
+  preConfigure = "runhaskell Setup.lhs clean";
   meta = {
     homepage = "http://bnfc.digitalgrammars.com/";
     description = "A compiler front-end generator";