First of all, after vcron is emerged, there are 2 identical crontabs: /etc/crontab /var/spool/cron/crontabs/root The first one originates from vcron, but portage doesn't seem to be able to track the second one (i.e. "qpkg -f /var/spool/cron/crontabs/root" returns nothing). The second problem is that vcron has another crontab format for /var/spool/cron/crontabs/*. The user name contained in the installed crontab is interpreted by vcron as a command, but since there is no such command (root), the following text is emailed to root every 15 minutes: /bin/sh: root: command not found vcron considers the crontab name to be the user name (see "man 5 crontab"), there is one crontab per user, so the user name must not be included in the crontab contents.
I emerged vcron on my system earlier today and I don't see this problem. I suspect that you typed "crontab /etc/crontab" during the install (which is required for the other crons, but not vcron). If so, the fix is just to type "crontab -r" as root.
Yes, it's possible. Unfortunately it's already out of my .bash_history, but it would explain, why portage doesn't know anything about the second crontab.
