From 65ddcaa3ed2c7771739638100bc20e5cbf61a603 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 13 Apr 2012 12:32:51 +0000
Subject: [PATCH] * Bison: use an absolute path to M4.  Otherwise Bison will
 silently   fail (due to a SIGPIPE) if M4 isn't installed.

svn path=/nixpkgs/branches/stdenv-updates/; revision=33772
---
 pkgs/development/tools/parsing/bison/bison-2.5.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/tools/parsing/bison/bison-2.5.nix b/pkgs/development/tools/parsing/bison/bison-2.5.nix
index 98c465a185cf..ea50b8590204 100644
--- a/pkgs/development/tools/parsing/bison/bison-2.5.nix
+++ b/pkgs/development/tools/parsing/bison/bison-2.5.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     ++ stdenv.lib.optional doCheck perl;
   propagatedBuildInputs = [ m4 ];
 
-  M4 = "m4";
+  M4 = "${m4}/bin/m4";
 
   doCheck = true;