anchor.diff:  { stdenv, lib, fetchurl, makeWrapper, fakeroot, file, getopt
  -, gtk2, gdk_pixbuf, glib, mesa_glu, postgresql, nss, nspr
  +, gtk2, gdk_pixbuf, glib, mesa_glu, postgresql, nss, nspr, udev
   , alsaLib, GConf, cups, libcap, fontconfig, freetype, pango
   , cairo, dbus, expat, zlib, libpng12, nodejs, gnutar, gcc, gcc_32bit
   , libX11, libXcursor, libXdamage, libXfixes, libXrender, libXi
  
positive.code:   '';
  
    dontStrip = true;
  
    meta = with stdenv.lib; {
      homepage = https://unity3d.com/;
  
negative.code:   libPath64 = lib.makeLibraryPath [
      gcc.cc gtk2 gdk_pixbuf glib mesa_glu postgresql nss nspr
      alsaLib GConf cups libcap fontconfig freetype pango
      cairo dbus expat zlib libpng12 udev
      libX11 libXcursor libXdamage libXfixes libXrender libXi
      libXcomposite libXext libXrandr libXtst libSM libICE libxcb
    ];
  