anchor.diff:      sha256 = "1clf1axkns23wfmh48xfspzsnw04pjh4mq1pshpzvj0cwxhz0yaq";
     };
   
  +  strictDeps = true;
     nativeBuildInputs = [ python3 unzip autoreconfHook ];
  +  buildInputs = [ python3 ];
   
     # install filters early, so their shebangs are patched too
     postPatch = with lib; ''
  
positive.code:         -e "s|^XMLLINT =.*|XMLLINT = '${libxml2.bin}/bin/xmllint'|" \
          -i a2x.py
    '') + ''
      patchShebangs .
  
      # Note: this substitution will not work in the planned 10.0.0 release:
      #
  
negative.code: 
  # java is problematic on some platforms, where it is unfree
  , enableJava ? true
  
  , buildPackages
  }:
  
  assert enableStandardFeatures ->
  