anchor.diff:  
     postFixup = ''
       for file in $(find $out -type f \( -perm /0111 -o -name \*.so\* -or -name \*.node\* \) ); do
  -                patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" "$file" || true
  -                patchelf --set-rpath ${rpath}:$out/share/skypeforlinux $file || true
  +      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" "$file" || true
  +      patchelf --set-rpath ${rpath}:$out/share/skypeforlinux $file || true
       done
   
       ln -s "$out/share/skypeforlinux/skypeforlinux" "$out/bin/skypeforlinux"
  
positive.code: { stdenv, fetchurl, dpkg, makeWrapper
  , alsaLib, atk, cairo, cups, curl, dbus, expat, fontconfig, freetype, glib, glibc, gnome2, libsecret
  , libnotify, nspr, nss, systemd, xorg, libv4l, libstdcxx5 }:
  
  let
  
    version = "5.5.0.1";
  
    rpath = stdenv.lib.makeLibraryPath [
      alsaLib
  
negative.code:     fontconfig
      freetype
      glib
      glibc
      libsecret
  
      gnome2.GConf
      gnome2.gdk_pixbuf
  