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-rw-r--r--pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix2
-rw-r--r--pkgs/development/haskell-modules/lib.nix2
2 files changed, 3 insertions, 1 deletions
diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
index 2e95c78c625c..4fbb5056837e 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
@@ -52,7 +52,7 @@ self: super: {
   haddock-api = super.haddock-api_2_15_0_2;
 
   # This is part of bytestring in our compiler.
-  bytestring-builder = dontHaddock super.bytestring-builder;
+  bytestring-builder = triggerRebuild (dontHaddock super.bytestring-builder) 1;
 
   # Won't compile against mtl 2.1.x.
   imports = super.imports.override { mtl = self.mtl_2_2_1; };
diff --git a/pkgs/development/haskell-modules/lib.nix b/pkgs/development/haskell-modules/lib.nix
index e601c7665ac4..9b47b047bf66 100644
--- a/pkgs/development/haskell-modules/lib.nix
+++ b/pkgs/development/haskell-modules/lib.nix
@@ -77,4 +77,6 @@ rec {
 
   buildStrictly = pkg: buildFromSdist (appendConfigureFlag pkg "--ghc-option=-Wall --ghc-option=-Werror");
 
+  triggerRebuild = drv: i: overrideCabal drv (drv: { postUnpack = ": trigger rebuild ${toString i}"; });
+
 }