anchor.diff:  { lib, stdenv, fetchFromGitHub, cmake, boost, pkg-config, doxygen, qt48Full, libharu
   , pango, fcgi, firebird, libmysqlclient, postgresql, graphicsmagick, glew, openssl
  -, pcre, harfbuzz
  +, pcre, harfbuzz, icu
   }:
   
   let
  
positive.code:       buildInputs = [
          boost doxygen qt48Full libharu
          pango fcgi firebird libmysqlclient postgresql graphicsmagick glew
          openssl pcre harfbuzz
        ];
  
        cmakeFlags = [
  
negative.code:     };
  in {
    wt3 = generic {
      version = "3.7.1";
      sha256 = "19gf5lbrc5shpvcdyzjh20k8zdj4cybxqvkhwqfl9rvhw89qr11k";
    };
  
    wt4 = generic {
      version = "4.6.1";
      sha256 = "04pv4kb8d576bfnd9kjc3cfjls9cm3cgpaiabwb3iyq9z0w585gh";
    };
  }
  