anchor.diff:  
     # Remove unnecessary static lib
     preFixup = ''
  -    moveToOutput bin/js60-config "$dev"
  +    moveToOutput bin/js78-config "$dev"
       rm $out/lib/libjs_static.ajs
  -    ln -s $out/bin/js60 $out/bin/js
  +    ln -s $out/bin/js78 $out/bin/js
     '';
   
     enableParallelBuilding = true;
  
positive.code:     description = "Mozilla's JavaScript engine written in C/C++";
      homepage = "https://developer.mozilla.org/en/SpiderMonkey";
      license = licenses.gpl2; # TODO: MPL/GPL/LGPL tri-license.
      maintainers = [ maintainers.abbradar ];
      platforms = platforms.linux;
    };
  }
  
negative.code:     nspr
      readline
      zlib
    ];
  
    preConfigure = ''
  