anchor.diff:      # R20
       erlangR20 = lib.callErlang ../development/interpreters/erlang/R20.nix {
         wxGTK = wxGTK30;
  +      autoconf = autoconf269;
       };
       erlangR20_odbc = erlangR20.override { odbcSupport = true; };
       erlangR20_javac = erlangR20.override { javacSupport = true; };
  
positive.code:     erlangR18 = lib.callErlang ../development/interpreters/erlang/R18.nix {
        wxGTK = wxGTK30;
        openssl = openssl_1_0_2;
      };
      erlangR18_odbc = erlangR18.override { odbcSupport = true; };
      erlangR18_javac = erlangR18.override { javacSupport = true; };
  
negative.code:     erlangR19 = lib.callErlang ../development/interpreters/erlang/R19.nix {
        wxGTK = wxGTK30;
        openssl = openssl_1_0_2;
        autoconf = autoconf269;
      };
      erlangR19_odbc = erlangR19.override { odbcSupport = true; };
      erlangR19_javac = erlangR19.override { javacSupport = true; };
  