anchor.diff:  
       # Basho fork, using custom builder.
       erlang_basho_R16B02 = lib.callErlang ../development/interpreters/erlang/R16B02-basho.nix {
  +      autoconf = autoconf269;
       };
       erlang_basho_R16B02_odbc = erlang_basho_R16B02.override {
         odbcSupport = true;
  
positive.code:     # R21
      erlangR21 = lib.callErlang ../development/interpreters/erlang/R21.nix {
        wxGTK = wxGTK30;
      };
      erlangR21_odbc = erlangR21.override { odbcSupport = true; };
      erlangR21_javac = erlangR21.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; };
  