anchor.diff:      expat
       fontconfig
       freetype
  -    gcc.cc
       gdk_pixbuf
       glib
       gnome2.GConf
  +    gnome3.gsettings-desktop-schemas
       gtk3
       libnotify
       nspr
  
positive.code: { stdenv, fetchurl, alsaLib, atk, cairo, cups
  , dbus, expat, fontconfig, freetype, gcc, gdk_pixbuf, glib, gnome2, gtk3
  , libnotify, nspr, nss, pango, systemd, xorg }:
  
  let
    libPath = stdenv.lib.makeLibraryPath [
      alsaLib
      atk
      cairo
  
negative.code:     pango
      systemd
      xorg.libX11
      xorg.libXScrnSaver
      xorg.libXcomposite
      xorg.libXcursor
      xorg.libXdamage
  