anchor.diff:    buildInputs = [
       pkgconfig perl perlXMLParser gtk libXft libpng zlib popt boehmgc
       libxml2 libxslt glib gtkmm glibmm libsigcxx lcms boost gettext
  -    makeWrapper intltool gsl poppler imagemagick libwpg
  +    makeWrapper intltool gsl poppler imagemagick libwpg librevenge
  +    libvisio libcdr libexif
     ];
  -
  -  configureFlags = "--with-python";
   
     enableParallelBuilding = true;
     doCheck = true;
  -  checkFlags = "-j1";
   
     postInstall = ''
       # Make sure PyXML modules can be found at run-time.
  
positive.code:        --prefix PATH : ${python}/bin ||  \
          exit 2
      done
      rm $out/share/icons/hicolor/icon-theme.cache
    '';
  
    NIX_LDFLAGS = "-lX11";
  
    meta = with stdenv.lib; {
      license = "GPL";
  
negative.code: { stdenv, fetchurl, pkgconfig, perl, perlXMLParser, gtk, libXft
  , libpng, zlib, popt, boehmgc, libxml2, libxslt, glib, gtkmm
  , glibmm, libsigcxx, lcms, boost, gettext, makeWrapper, intltool
  , gsl, python, pyxml, lxml, poppler, imagemagick, libwpg, librevenge
  , libvisio, libcdr, libexif
  }:
  
  stdenv.mkDerivation rec {
    name = "inkscape-0.91";
  
    src = fetchurl {
      url = "https://inkscape.global.ssl.fastly.net/media/resources/file/"
          + "${name}.tar.bz2";
      sha256 = "06ql3x732x2rlnanv0a8aharsnj91j5kplksg574090rks51z42d";
    };
  
    postPatch = ''
      patchShebangs share/extensions
    '';
  
    propagatedBuildInputs = [
      # Python is used at run-time to execute scripts, e.g., those from
  