anchor.diff:    src =
       if stdenv.system == "x86_64-linux" then
         fetchurl {
  -        url = "https://repo.skype.com/deb/pool/main/s/skypeforlinux/skypeforlinux_5.2.0.1_amd64.deb";
  -        sha256 = "1dwyj5wm2amkysbnzxsskq6sl7rbqggm6n4sabnq7wd5xnbq4i06";
  +        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}";
  
positive.code: 
  let
  
    version = "5.2.0.1";
  
    rpath = stdenv.lib.makeLibraryPath [
      alsaLib
  
negative.code:     gnome2.pango
  
      gnome2.gnome_keyring
  
      libnotify
      nspr
      nss
  