From eb5f4d3d36199d48cd2cf6a5cb0fe2da569e489b Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Sun, 9 Aug 2015 16:28:12 +0200
Subject: [PATCH] ghc: make sure the HEAD version is built with a deterministic
 version number

---
 pkgs/development/compilers/ghc/head.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index c92f002a0262..6c3041f2943c 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -29,6 +29,8 @@ stdenv.mkDerivation rec {
 
   postUnpack = ''
     pushd ghc-${builtins.substring 0 7 rev}
+    echo ${version} >VERSION
+    echo ${rev} >GIT_COMMIT_ID
     patchShebangs .
     ./boot
     popd