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:     RPATH="${ldpath}:$out/${appdir}"
      makeWrapper "$out/${appdir}/dropbox" "$out/bin/dropbox" \
        --prefix LD_LIBRARY_PATH : "$RPATH"
    '';
  
    fixupPhase = ''
  
negative.code: let
    # NOTE: When updating, please also update in current stable,
    # as older versions stop working
    version = "8.4.21";
    sha256 =
      {
        "x86_64-linux" = "1nihmr99mzyjhhdlg39j6g0m6hqgdz80lgrjdw1nnh38vq4fgbnq";
        "i686-linux"   = "09jfdc8isjcpvgnvfykawlvdq65ng0dg6b54m4vdswk58ggndvlq";
      }."${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
  