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-rw-r--r--pkgs/development/haskell-modules/make-package-set.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/haskell-modules/make-package-set.nix b/pkgs/development/haskell-modules/make-package-set.nix
index 61043252155e..cceaa360105c 100644
--- a/pkgs/development/haskell-modules/make-package-set.nix
+++ b/pkgs/development/haskell-modules/make-package-set.nix
@@ -44,6 +44,7 @@ let
       isLibrary = false;
       doHaddock = false;
       hyperlinkSource = false;      # Avoid depending on hscolour for this build.
+      enableSeparateEtcOutput = false; # The flag to support this is missing in old versions of cabal.
       postFixup = "rm -rf $out/lib $out/share $out/nix-support";
     });
     cpphs = overrideCabal (self.cpphs.overrideScope (self: super: {