dovecot2 install failure

[bsdperson]

Freebsd 9.2-Release

$ sudo portmaster mail/dovecot2

===>>> Port directory: /usr/ports/mail/dovecot2

===>>> Gathering distinfo list for installed ports

===>>> Launching 'make checksum' for mail/dovecot2 in background
===>>> Gathering dependency list for mail/dovecot2 from ports
===>>> Initial dependency check complete for mail/dovecot2


===>>> Starting build for mail/dovecot2 <<<===

===>>> All dependencies are up to date

===>  Cleaning for dovecot-2.2.4
===>  License LGPL21 MIT accepted by the user
===>  Found saved configuration for dovecot-2.2.4
===>   dovecot-2.2.4 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by dovecot-2.2.4 for building
===>  Extracting for dovecot-2.2.4
=> SHA256 Checksum OK for dovecot-2.2.4.tar.gz.


...[snip]...

/bin/sh ./sed.sh . /var/run/dovecot /usr/local/etc/dovecot  < dovecot.1.in > dovecot.1
/bin/sh ./sed.sh . /var/run/dovecot /usr/local/etc/dovecot  < dovecot-lda.1.in > dovecot-lda.1
/bin/sh ./sed.sh . /var/run/dovecot /usr/local/etc/dovecot  < dsync.1.in > dsync.1
===>  Installing for dovecot-2.2.4
===>   Generating temporary packing list
===>  Checking if mail/dovecot2 already installed
===> Creating users and/or groups.
Using existing group `dovecot'.
Using existing group `dovenull'.
Creating user `dovecot' with uid `143'.
pw: user 'dovecot' already exists
*** [create-users-groups] Error code 74

Stop in /usr/ports/mail/dovecot2.
*** [install] Error code 1

Stop in /usr/ports/mail/dovecot2.

===>>> Installation of dovecot-2.2.4 (mail/dovecot2) failed
===>>> Aborting update

===>>> Killing background jobs
Terminated

===>>> You can restart from the point of failure with this command line:
       portmaster <flags> mail/dovecot2

===>>> Exiting
[1]    41941 exit 1     sudo portmaster mail/dovecot2
sudo portmaster mail/dovecot2  273.29s user 74.77s system 93% cpu 6:11.98 total
$

Huh? What's up with this? How do I install dovecot using ports?