jailbreak-cabal: always build the tool with Cabal 1.20

This change mitigates the effects of https://github.com/peti/jailbreak-cabal/issues/9.

1 files changed, 4 insertions, 2 deletions

diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.2.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.2.x.nix
index 4a8d4242bdc9..98bad4fa1be0 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.2.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.2.x.nix
@@ -50,8 +50,10 @@ self: super: {
   # https://github.com/tibbe/hashable/issues/85
   hashable = dontCheck super.hashable;
 
-  # Needs Cabal >= 1.18.x.
-  jailbreak-cabal = super.jailbreak-cabal.override { Cabal = self.Cabal_1_18_1_6; };
+  # https://github.com/peti/jailbreak-cabal/issues/9
+  jailbreak-cabal = super.jailbreak-cabal.override {
+    Cabal = dontJailbreak (self.Cabal_1_20_0_3.override { deepseq = dontJailbreak self.deepseq_1_3_0_1; });
+  };
 
   # Haddock chokes on the prologue from the cabal file.
   ChasingBottoms = dontHaddock super.ChasingBottoms;