anchor.diff:  
   let
   
  -  version = "5.2.0.1";
  +  version = "5.3.0.1";
   
     rpath = stdenv.lib.makeLibraryPath [
       alsaLib
  
positive.code:     gnome2.pango
  
      gnome2.gnome_keyring
      
      libnotify
      nspr
      nss
  
negative.code:   src =
      if stdenv.system == "x86_64-linux" then
        fetchurl {
          url = "https://repo.skype.com/deb/pool/main/s/skypeforlinux/skypeforlinux_${version}_amd64.deb";
          sha256 = "08sf9nqnznsydw4965w7ixwwba54hjc02ga7vcnz9vpx5hln3nrz";
        }
      else
        throw "Skype for linux is not supported on ${stdenv.system}";
  