From 56c970ae014a9f0dac752cbf6a5a6a365ff873b7 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Fri, 23 Jan 2015 21:55:10 +0100
Subject: [PATCH] haskell-utf8-string: fix build with ghc-6.12.x

---
 .../development/haskell-modules/configuration-ghc-6.12.x.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-6.12.x.nix b/pkgs/development/haskell-modules/configuration-ghc-6.12.x.nix
index 764064ae903..bc558a7821e 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-6.12.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-6.12.x.nix
@@ -59,7 +59,10 @@ self: super: {
   ChasingBottoms = dontHaddock super.ChasingBottoms;
 
   # https://github.com/glguy/utf8-string/issues/9
-  utf8-string = appendConfigureFlag super.utf8-string "--ghc-option=-XUndecidableInstances";
+  utf8-string = overrideCabal super.utf8-string (drv: {
+    configureFlags = drv.configureFlags or [] ++ ["-f-bytestring-in-base" "--ghc-option=-XUndecidableInstances"];
+    preConfigure = "sed -i -e 's|base >= .* < .*,|base,|' utf8-string.cabal";
+  });
 
   # https://github.com/haskell/HTTP/issues/80
   HTTP = doJailbreak super.HTTP;