pkg/49420: opendmarc core dumps

[frederic%fauberteau.org@localhost]

>Number:         49420
>Category:       pkg
>Synopsis:       opendmarc core dumps
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 26 15:45:00 +0000 2014
>Originator:     Frédéric Fauberteau
>Release:        6.1.4 amd64 pkgsrc-2014Q3
>Organization:
>Environment:
NetBSD netbsd 6.1.4_PATCH NetBSD 6.1.4_PATCH (XEN3_DOMU) amd64
>Description:
opendmarc core dumps when it is requested by postfix as a milter.

When I send a mail with opendmarc running in the foreground, I get:
_res is not supported for multi-threaded programs.
Abort trap (core dumped)

What kind of trace could I supply to help the understanding of this bug ?
>How-To-Repeat:
Run opendmarc, configure it as a milter and send/receive a mail.
>Fix: