pkg_add: Warning: package `digest-20111104' was built for a platform:
pkg_add: NetBSD/i386 5.99.60 (pkg) vs. NetBSD/i386 6.0_BETA (this host)
libffi-3.0.9nb1: registering info file /usr/pkg/info/libffi.info
===========================================================================
$NetBSD: MESSAGE,v 1.1.1.1 2008/02/14 11:00:13 kefren Exp $

By default dynamips will eat up all your CPU cycles.

In this case you'll have to supply an idlepc value specific to each IOS
version. For more information see:

        http://dynagen.org/tutorial.htm#_Toc176827651

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