[ebuild  N    ] kde-base/kdebase-meta-4.6.1  USE="(-aqua) (-kdeprefix)" 0 kB
[blocks B     ] <sys-auth/policykit-0.92 ("<sys-auth/policykit-0.92" is blocking sys-auth/polkit-0.100)

Total: 318 packages (14 upgrades, 301 new, 3 in new slots), Size of downloads: 664,211 kB
Conflict: 1 block (1 unsatisfied)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (sys-auth/polkit-0.100, ebuild scheduled for merge) pulled in by
    >=sys-auth/polkit-0.97 required by (sys-fs/udisks-1.0.2, ebuild scheduled for merge)
    >=sys-auth/polkit-0.99 required by (sys-auth/polkit-qt-0.99.0, ebuild scheduled for merge)
    >=sys-auth/polkit-0.97 required by (sys-power/upower-0.9.8, ebuild scheduled for merge)

  (sys-auth/policykit-0.9-r1, installed) pulled in by
    sys-auth/policykit required by @selected