anchor.diff:  
     postFetch =
       ''
  -      export PATH=${unzip}/bin:$PATH
  -
         unpackDir="$TMPDIR/unpack"
         mkdir "$unpackDir"
         cd "$unpackDir"
  
positive.code:       mv "$unpackDir" "$out"
      '') #*/
      + extraPostFetch;
  } // removeAttrs args [ "stripRoot" "extraPostFetch" ]))
  # Hackety-hack: we actually need unzip hooks, too
  (x: {nativeBuildInputs = x.nativeBuildInputs++ [unzip];})
  
negative.code: , name ? "source"
  , ... } @ args:
  
  (fetchurl ({
    inherit name;
  
    recursiveHash = true;
  