From c088e393410b786b4d5aab87e27a5b6bf8b9082d Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rekado@elephly.net>
Date: Mon, 12 Feb 2018 19:04:25 +0100
Subject: gnu: ghc-mtl: Fix build with GHC 8.

* gnu/packages/haskell.scm (ghc-mtl)[inputs]: Add ghc-transformers.
[arguments]: Permit building with newer version of transformers.
---
 gnu/packages/haskell.scm | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'gnu')

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 5857540d23..c6a8376aa1 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -1479,6 +1479,10 @@ installation of Haskell libraries and programs.")
         (base32
          "1icdbj2rshzn0m1zz5wa7v3xvkf6qw811p4s7jgqwvx1ydwrvrfa"))))
     (build-system haskell-build-system)
+    (arguments
+     `(#:configure-flags (list "--allow-newer=transformers")))
+    (inputs
+     `(("ghc-transformers" ,ghc-transformers)))
     (home-page "https://github.com/ekmett/mtl")
     (synopsis
      "Monad classes, using functional dependencies")
-- 
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