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-rw-r--r--pkgs/development/haskell-modules/generic-builder.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index e097fd5af33e..a8da63493a43 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -211,7 +211,7 @@ stdenv.mkDerivation ({
     configureFlags="${concatStringsSep " " defaultConfigureFlags} $configureFlags"
 
     # nativePkgs defined in stdenv/setup.hs
-    for p in $nativePkgs; do
+    for p in "''${!nativePkgs[@]}"; do
       if [ -d "$p/lib/${ghc.name}/package.conf.d" ]; then
         cp -f "$p/lib/${ghc.name}/package.conf.d/"*.conf $packageConfDir/
         continue