From ec8b81615462625338d76f002d92accd6eb4cf6a Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Tue, 4 Oct 2016 21:32:09 +0200
Subject: [PATCH] Extend Haskell generic builder to use new --ipid flag.

---
 pkgs/development/haskell-modules/generic-builder.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 2b597532b44..e4fcd09c0e0 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -180,6 +180,11 @@ stdenv.mkDerivation ({
     setupCompileFlags="${concatStringsSep " " setupCompileFlags}"
     configureFlags="${concatStringsSep " " defaultConfigureFlags} $configureFlags"
 
+    ${optionalString (stdenv.lib.versionOlder "8" ghc.version) ''
+      ipid=$(echo $(basename "$out") | cut -d- -f1)
+      configureFlags+=" --ipid=$ipid"
+    ''}
+
     local inputClosure=""
     for i in $propagatedNativeBuildInputs $nativeBuildInputs; do
       findInputs $i inputClosure propagated-native-build-inputs