I've tried two builds with -j16 and one with -j8, successfully, so
remove MAKE_JOBS_SAFE=no line.
+ botan-1.10.5, dbus-glib-0.100.2, digikam-3.0.0, fotoxx-13.03,
  gnutls-3.1.9 [needs nettle-2.5], harfbuzz-0.9.13, libgpg-error-1.11,
  libvisio-0.0.25, mkvtoolnix-6.1.0, mono-3.0.6, protobuf-2.5.0,
  raptor2-2.0.9, wine-devel-1.5.25 [wait until NetBSD gains OSS 4
  [kern/46611] or bring OSS 3 support back], x264-devel-20130302.
Update apache maven to 3.0.5.

http://maven.apache.org/docs/3.0.5/release-notes.html

Apache Maven 3.0.5 is a maintenance release to fix a security
issue CVE-2013-0253 Apache Maven 3.0.4

http://maven.apache.org/security.html

CVE-2013-0253 Apache Maven 3.0.4

Apache Maven 3.0.4 (with Apache Maven Wagon 2.1) has
introduced a non-secure SSL mode by default. This mode
disables all SSL certificate checking, including: host
name verification , date validity, and certificate chain.
Not validating the certificate introduces the possibility
of a man-in-the-middle attack.

All users are recommended to upgrade to Apache Maven 3.0.5
and Apache Maven Wagon 2.4.
Updated devel/apache-maven to 3.0.5