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-rw-r--r--pkgs/development/libraries/haskell/data-pprint/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/pkgs/development/libraries/haskell/data-pprint/default.nix b/pkgs/development/libraries/haskell/data-pprint/default.nix
index 8b73d5be568d..351f1d834776 100644
--- a/pkgs/development/libraries/haskell/data-pprint/default.nix
+++ b/pkgs/development/libraries/haskell/data-pprint/default.nix
@@ -1,4 +1,4 @@
-{ cabal, deepseq, mtl, parallel, time }:
+{ cabal, deepseq, mtl, parallel, time, fetchurl }:
 
 cabal.mkDerivation (self: {
   pname = "data-pprint";
@@ -9,6 +9,7 @@ cabal.mkDerivation (self: {
                           sha256 = "0wxvc7cbv4qpjl5zxy41863qpzda2ma75pmnnqx29qyh3rxp7biw";
                         })
             ];
+  patchFlags = "-p2";
   meta = {
     description = "Prettyprint and compare Data values";
     license = self.stdenv.lib.licenses.bsd3;