anchor.diff:      poppler
       pythonPackages.python
       pythonPackages.pygtk
  +    xorg.fixesproto
  +    xorg.libICE
  +    xorg.libSM
  +    xorg.libX11
  +    xorg.libXcursor
       xorg.libXext
       xorg.libXfixes
       xorg.libXmu
       xorg.libXpm
  +    xorg.libXt
  +    xorg.xproto
  +    xz
       zlib
  -    ice
     ];
   
     pythonPath = [
  
positive.code: 
    buildInputs = [
      aalib
      atk
      babl
      bzip2
  
negative.code: , pythonPackages
  
  , aalib
  , alsa-lib
  , atk
  , babl
  , bzip2
  