Problema al actualizar server

Estimados.
Tengo un CDS funcionando hace 3 años, como PDC y file server.
Desde que se puso en producción nunca se actualizó.
Como está dando algunos problemas de bloqueo de archivos, decidimos actualizarlo.
Pero al intentar los comandos habituales, nos tira algunos errores y no permite ningún proceso de actualización.
Cito ejemplos de salidas.

emerge -uaD world
!!! Invalid news item: /usr/portage/metadata/news/2017-04-10-split-and-slotted-wine/2017-04-10-split-and-slotted-wine.en.txt
!!!   line 6: News-Item-Format: 2.0

 * IMPORTANT: 27 news items need reading for repository 'gentoo'.
 * Use eselect news to read news items.


These are the packages that would be merged, in order:

Calculating dependencies -

!!! Problem resolving dependencies for net-dns/bind from @selected                                                                                                ... done!

!!! The ebuild selected to satisfy "net-dns/bind" has unmet requirements.
- net-dns/bind-9.11.0_p5::gentoo USE="berkdb caps ipv6 ssl threads zlib -dlz -dnstap -doc -filter-aaaa -fixed-rrset -geoip -gost -gssapi -idn -json -ldap (-libressl) -lmdb -mysql -nslint -odbc -postgres -python -rpz (-seccomp) (-selinux) -static-libs -urandom -xml" ABI_X86="64" PYTHON_TARGETS="python2_7 python3_4 -python3_5 -python3_6"

  The following REQUIRED_USE flag constraints are unsatisfied:
    berkdb? ( dlz )

  The above constraints are a subset of the following complete expression:
    postgres? ( dlz ) berkdb? ( dlz ) mysql? ( dlz !threads ) odbc? ( dlz ) ldap? ( dlz ) gost? ( !libressl ssl ) threads? ( caps ) dnstap? ( threads ) python? ( any-of ( python_targets_python2_7 python_targets_python3_4 python_targets_python3_5 python_targets_python3_6 ) )

(dependency required by "@selected" [set])
(dependency required by "@world" [argument])

Intentando actualizar portage…

emerge --oneshot portage
!!! Invalid news item: /usr/portage/metadata/news/2017-04-10-split-and-slotted-wine/2017-04-10-split-and-slotted-wine.en.txt
!!!   line 6: News-Item-Format: 2.0

 * IMPORTANT: 27 news items need reading for repository 'gentoo'.
 * Use eselect news to read news items.

Calculating dependencies... done!

!!! All ebuilds that could satisfy "dev-python/setuptools[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-)]" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-python/setuptools-9999::gentoo (masked by: EAPI 6)
- dev-python/setuptools-35.0.2::gentoo (masked by: EAPI 6)
- dev-python/setuptools-35.0.1::gentoo (masked by: EAPI 6)
- dev-python/setuptools-34.0.2-r1::gentoo (masked by: EAPI 6)
- dev-python/setuptools-30.4.0::gentoo (masked by: EAPI 6)

The current version of portage supports EAPI '5'. You must upgrade to a
newer version of portage before EAPI masked packages can be installed.
(dependency required by "dev-python/pyxattr-0.5.5" [ebuild])
(dependency required by "sys-apps/portage-2.3.5[python_targets_python2_7,xattr]" [ebuild])
(dependency required by "portage" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.

Agradezco cualquier sugerencia, y me alegro que por fin haya una referencia actualizada y en español!!!