CXXFLAGS+=" -std=c++0x"

CXXFLAGS+=" -std=c++11"

static void openConnection(const string & sshName, const string & sshKey,
    int stderrFD, Child & child)

static void openConnection(Machine::ptr machine, Path tmpDir, int stderrFD, Child & child)

        if (sshName == "localhost")

        if (machine->sshName == "localhost")

            argv = {"ssh", sshName};
            if (sshKey != "" && sshKey != "-") append(argv, {"-i", sshKey});

            argv = {"ssh", machine->sshName};
            if (machine->sshKey != "") append(argv, {"-i", machine->sshKey});
            if (machine->sshPublicHostKey != "") {
                Path fileName = tmpDir + "/host-key";
                auto p = machine->sshName.find("@");
                string host = p != string::npos ? string(machine->sshName, p + 1) : machine->sshName;
                writeFile(fileName, host + " " + machine->sshPublicHostKey + "\n");
                append(argv, {"-oUserKnownHostsFile=" + fileName});
            }

    nix::Path tmpDir = createTempDir();
    AutoDelete tmpDirDel(tmpDir, true);

    openConnection(machine->sshName, machine->sshKey, logFD, child);

    openConnection(machine, tmpDir, logFD, child);

        tokens.resize(7);

        tokens.resize(8);

        machine->sshKey = tokens[2];

        machine->sshKey = tokens[2] == "-" ? string("") : tokens[2];

        if (tokens[7] != "" && tokens[7] != "-")
            machine->sshPublicHostKey = base64Decode(tokens[7]);

    std::string sshPublicHostKey;