anchor.diff:  
     installPhase = ''
       mkdir -p "$out/${appdir}"
  -    cp -r "dropbox-lnx.${arch}-${version}"/* "$out/${appdir}/"
  +    cp -r --no-preserve=mode "dropbox-lnx.${arch}-${version}"/* "$out/${appdir}/"
   
       rm "$out/${appdir}/libdrm.so.2"
       rm "$out/${appdir}/libffi.so.6"
  
positive.code: let
    # NOTE: When updating, please also update in current stable,
    # as older versions stop working
    version = "8.4.19";
    sha256 =
      {
        "x86_64-linux" = "0pm43cklsm41mg463mz0ypvbladm2mz65s7ar9z4k4hgjrhyh67j";
        "i686-linux" = "0myz8s2xdl034zb4548fgzz2f5gfvzfr1nwp50fh3f3hmf6frgp3";
      }."${stdenv.system}" or (throw "system ${stdenv.system} not supported");
  
    arch =
      {
        "x86_64-linux" = "x86_64";
        "i686-linux" = "x86";
      }."${stdenv.system}" or (throw "system ${stdenv.system} not supported");
  
    # relative location where the dropbox libraries are stored
  
negative.code:     RPATH="${ldpath}:$out/${appdir}"
      makeWrapper "$out/${appdir}/dropbox" "$out/bin/dropbox" \
        --prefix LD_LIBRARY_PATH : "$RPATH"
  
      chmod 755 $out/${appdir}/dropbox
    '';
  
    fixupPhase = ''
  