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:     substituteInPlace $out/share/applications/skypeforlinux.desktop \
        --replace /usr/bin/ $out/bin/ \
        --replace /usr/share/ $out/share/
  
    '';
  
    meta = with stdenv.lib; {
      description = "Linux client for skype";
      homepage = https://www.skype.com;
      license = licenses.unfree;
      maintainers = with stdenv.lib.maintainers; [ panaeon ];
      platforms = [ "x86_64-linux" ];
    };
  }
  
  
negative.code:     gnome2.gnome_keyring
  
      libnotify
      libpulseaudio
      nspr
      nss
      stdenv.cc.cc
      systemd
      libstdcxx5
      libv4l
  
      xorg.libxkbfile
  