anchor.diff:      perl perlXMLParser libXft libpng zlib popt boehmgc
       libxml2 libxslt glib gtkmm2 glibmm libsigcxx lcms boost gettext
       makeWrapper gsl poppler imagemagick libwpg librevenge
  -    libvisio libcdr libexif potrace python2Env
  +    libvisio libcdr libexif potrace python2Env icu
     ];
   
     enableParallelBuilding = true;
  
positive.code:     patchShebangs share/extensions
      patchShebangs fix-roff-punct
  
      # Python is used at run-time to execute scripts, e.g., those from
      # the "Effects" menu.
      substituteInPlace src/extension/implementation/script.cpp \
  
negative.code: , gsl, python2, poppler, imagemagick, libwpg, librevenge
  , libvisio, libcdr, libexif, potrace, autoreconfHook
  , intltool
  , icu # Not needed for building with CMake
  , lib
  }:
  
  