anchor.diff:  { stdenv, fetchFromGitHub, cmake, boost, pkgconfig, doxygen, qt48Full, libharu
   , pango, fcgi, firebird, mysql, postgresql, graphicsmagick, glew, openssl
  -, pcre
  +, pcre, harfbuzz
   }:
   
   let
  
positive.code:     };
  in {
    wt3 = generic {
      version = "3.4.0";
      sha256 = "0y0b2h9jf5cg1gdh48dj32pj5nsvipab1cgygncxf98c46ikhysg";
    };
  
    wt4 = generic {
  
negative.code:         "-DWT_CPP_11_MODE=-std=c++11"
          "-DGM_PREFIX=${graphicsmagick}"
          "-DMYSQL_PREFIX=${mysql.connector-c}"
          "-DHARFBUZZ_INCLUDE_DIR=${harfbuzz.dev}/include"
          "--no-warn-unused-cli"
        ];
  
  