anchor.diff:  
   in stdenv.mkDerivation rec {
     name = "k2pdfopt-${version}";
  -  version = "2.30";
  +  version = "2.32";
     src = fetchzip {
       url = "http://www.willus.com/k2pdfopt/src/k2pdfopt_v${version}_src.zip";
  -    sha256 = "1fjjznkplrbyrg48wbij4kqgkz9i5icq7savl6brsf9haahdz6q5";
  +    sha256 = "1v3cj5bwpjvy7s66sfqcmkxs91f7nxaykjpdjm2wn87vn6q7n19m";
     };
   
     buildInputs = [ libX11 libXext autoconf automake libtool leptonica libpng libtiff zlib
  
positive.code:     plibs=`pwd`/patched_libraries
  
      tar zxf ${mupdf_src}
      cp $src/mupdf_mod/font.c $src/mupdf_mod/string.c mupdf-1.5-source/source/fitz/
      cp $src/mupdf_mod/pdf-* mupdf-1.5-source/source/pdf
  
      tar zxf ${tess_src}
      cp $src/tesseract_mod/dawg.cpp tesseract-ocr/dict
  
negative.code: 
  let
    mupdf_src = fetchurl {
      url = http://www.mupdf.com/downloads/archive/mupdf-1.6-source.tar.gz;
      sha256 = "0qx51rj6alzcagcixm59rvdpm54w6syrwr4184v439jh14ryw4wq";
    };
  
    tess_src = fetchurl {
  