Howto start vpopmail

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from vpopmail INSTALL

        env - PATH="/var/qmail/bin:/usr/local/bin" \
        tcpserver -H -R 0 pop-3 \
        /var/qmail/bin/qmail-popup pegasus.nuvo.fi \
        /home/vpopmail/bin/vchkpw /var/qmail/bin/qmail-pop3d
        Maildir &

hjums, it just don't start, there is no file called tcpserver.. any
ideads where I can get it?;) (Linux)