169/177: gnu: ghc-graphviz: Fix build with newer QuickCheck.

[Ricardo Wurmus]

rekado pushed a commit to branch master
in repository guix.

commit 4b1f2166fe5781a4e441fc22f993631fc113c341
Author: Ricardo Wurmus <address@hidden>
Date:   Tue Feb 13 12:18:39 2018 +0100

    gnu: ghc-graphviz: Fix build with newer QuickCheck.
    
    * gnu/packages/haskell.scm (ghc-graphviz)[arguments]: Allow building with
    newer QuickCheck.
---
 gnu/packages/haskell.scm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 19a78dc..827ae75 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -6707,6 +6707,8 @@ for generating graph-like data structures.")
                (base32
                 "1z453is01v0rnxlv6xx4iyaqv5vrp3bpz829mpv1a341sck2135h"))))
     (build-system haskell-build-system)
+    (arguments
+     `(#:configure-flags (list "--allow-newer=QuickCheck")))
     (inputs
      `(("ghc-quickcheck" ,ghc-quickcheck)
        ("ghc-colour" ,ghc-colour)