funtoo /home/rj # emerge -avuDN world

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

Calculating dependencies... done!
[ebuild N ] app-text/docbook-sgml-dtd-3.0-r3:3.0::text-kit 0 KiB
[ebuild N ] app-text/docbook-dsssl-stylesheets-1.79-r3::text-kit 0 KiB
[ebuild N ] dev-util/gtk-doc-1.25-r1::gnome-kit USE="-debug -doc -emacs -highlight -vim" PYTHON_TARGETS="python2_7" 0 KiB
[ebuild N ] gnome-base/gnome-common-3.18.0-r1:3::gnome-kit USE="autoconf-archive" 0 KiB
[ebuild U ] app-admin/sudo-1.8.25_p1::nokit [1.8.21_p2::core-kit] USE="nls pam sendmail -gcrypt -ldap -offensive -openssl -sasl (-selinux) -skey" 3,116 KiB
[ebuild UD ] sys-fs/udisks-2.7.4-r1:2::nokit [2.7.5:2::core-kit] USE="acl gptfdisk nls -cryptsetup -debug -elogind -introspection -lvm (-selinux) -systemd" 0 KiB

Total: 6 packages (1 upgrade, 1 downgrade, 4 new), Size of downloads: 3,116 KiB

!!! The following update has been skipped due to unsatisfied dependencies:

sys-fs/udisks:2

selected: (sys-fs/udisks-2.7.4-r1:2/2::nokit, ebuild scheduled for merge)
skipped: (sys-fs/udisks-2.8.0:2/2::nokit, ebuild scheduled for merge) (see unsatisfied dependency below)

emerge: there are no ebuilds to satisfy ">=sys-libs/libblockdev-2.19[cryptsetup,lvm?,vdo?]".
(dependency required by "sys-fs/udisks-2.8.0::nokit" [ebuild])