anchor.diff:    src = fetchgit {
       url = git://github.com/FreeRDP/FreeRDP.git;
       inherit rev;
  -    sha256 = "5e77163e2a728802fc426860b3f5ff88cb2f2f3b0bbf0912e9e44c3d8fa060e5";
  +    sha256 = "91ef562e96db483ada28236e524326a75b6942becce4fd2a65ace386186eccf7";
     };
   
     buildInputs = [
  
positive.code:     cunit
    ] ++ stdenv.lib.optional printerSupport cups;
  
    postUnpack = ''
      sed -i 's@xf_GetWorkArea(xfi)@///xf_GetWorkArea(xfi)@' git-export/client/X11/xf_monitor.c
    '';
  
    cmakeFlags = [ "-DWITH_DIRECTFB=ON" "-DWITH_CUNIT=ON" ];
  
  
negative.code: 
  assert printerSupport -> cups != null;
  
  let rev = "498b88a1da748a4a2b4dbd12c795ca87fee24bab"; in
  
  stdenv.mkDerivation rec {
    name = "freerdp-1.0pre${rev}";
  