anchor.diff:  { stdenv, fetchurl, libspotify, alsaLib, readline, pkgconfig, apiKey, unzip, gnused }:
   
  -let version = "12.1.51"; in
  +let 
  +  version = "12.1.51"; 
  +  isLinux = (stdenv.system == "x86_64-linux" || stdenv.system == "i686-linux");
  +in
   
  -if (stdenv.system != "x86_64-linux" && stdenv.system != "x86_64-darwin")
  +if (stdenv.system != "x86_64-linux" && stdenv.system != "x86_64-darwin" && stdenv.system != "i686-linux")
   then throw "Check https://developer.spotify.com/technologies/libspotify/ for a tarball for your system and add it here"
   else stdenv.mkDerivation {
     name = "libspotify-${version}";
  
positive.code:   buildInputs = stdenv.lib.optional (stdenv.system == "x86_64-darwin") unzip;
  
    # linux-specific
    installFlags = stdenv.lib.optionalString (stdenv.system == "x86_64-linux")
      "prefix=$(out)";
    patchPhase = stdenv.lib.optionalString (stdenv.system == "x86_64-linux")
      "${gnused}/bin/sed -i 's/ldconfig//' Makefile";
    postInstall = stdenv.lib.optionalString (stdenv.system == "x86_64-linux")
      "mv -v share $out";
  
    passthru = {
  
negative.code:         url    = "https://developer.spotify.com/download/libspotify/libspotify-${version}-Darwin-universal.zip";
          sha256 = "1gcgrc8arim3hnszcc886lmcdb4iigc08abkaa02l6gng43ky1c0";
        }
      else if stdenv.system == "i686-linux" then
        fetchurl {
          url    = "https://developer.spotify.com/download/libspotify/libspotify-${version}-Linux-i686-release.tar.gz";
          sha256 = "1bjmn64gbr4p9irq426yap4ipq9rb84zsyhjjr7frmmw22xb86ll";
        }
      else
        null;
  
  