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-rw-r--r--pkgs/stdenv/generic/make-derivation.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/stdenv/generic/make-derivation.nix b/pkgs/stdenv/generic/make-derivation.nix
index 8af162da7f2d..745426915987 100644
--- a/pkgs/stdenv/generic/make-derivation.nix
+++ b/pkgs/stdenv/generic/make-derivation.nix
@@ -62,7 +62,7 @@ let
                 f0 self super
               else x;
         in
-          makeDerivationExtensible (self: attrs // f self attrs))
+          makeDerivationExtensible (self: attrs // (if builtins.isFunction f0 || f0?__functor then f self attrs else f0)))
       attrs;
 
   mkDerivationSimple = overrideAttrs: