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

Calculating dependencies... done!
[ebuild     U ] app-emulation/emul-linux-x86-baselibs-20071128 [10.2] 21,605 kB
[ebuild     U ] sys-apps/util-linux-2.13-r2 [2.12r-r6] USE="crypt nls -old-linux% (-selinux) (-old-crypt%) (-perl%*) (-static%)" 2,679 kB
[ebuild     U ] app-emulation/emul-linux-x86-xlibs-20071128-r1 [10.0] USE="opengl" 20,126 kB
[ebuild  N    ] app-emulation/emul-linux-x86-gtklibs-20071121  USE="qt3" 4,850 kB
[ebuild  N    ] net-www/nspluginwrapper-0.9.91.5  267 kB
[blocks B     ] >=sys-apps/util-linux-2.13_pre (is blocking sys-process/schedutils-1.5.0)
[blocks B     ] sys-apps/setarch (is blocking sys-apps/util-linux-2.13-r2)
[blocks B     ] sys-process/schedutils (is blocking sys-apps/util-linux-2.13-r2)

Total: 5 packages (3 upgrades, 2 new, 3 blocks), Size of downloads: 49,526 kB

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

For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked