anchor.diff:      ++ optional zlibSupport zlib
       ++ optionals suggestSupport [ zeromq libevent msgpack ];
   
  -  nativeBuildInputs = [ autoconf automake pkg-config ];
  +  nativeBuildInputs = [ autoreconfHook pkg-config ];
   
     configureFlags = with lib;
          optional zlibSupport "--with-zlib"
  
positive.code: { lib, stdenv, fetchurl, mecab, kytea, libedit, pkg-config
  , suggestSupport ? false, zeromq, libevent, msgpack
  , lz4Support  ? false, lz4
  , zlibSupport ? false, zlib
  , autoconf, automake
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:   };
  
    preConfigure = ''
      # To avoid problems due to libc++abi 11 using `#include <version>`.
      rm version
    '';
  
    buildInputs = with lib;
  