# emerge -b coreutils
 Calculating dependencies... done!
 [ebuild     U ] sys-devel/automake-1.10.1 [1.10]
 [ebuild  N    ] app-arch/lzma-utils-4.32.6  USE="-nocxx"
 [ebuild     U ] sys-apps/coreutils-6.10-r2 [6.9-r1] USE="-acl* -nls* -vanilla%"
 [blocks B     ] sys-apps/mktemp (is blocking sys-apps/coreutils-6.10-r2)
 [blocks B     ] >=sys-apps/coreutils-6.10 (is blocking sys-apps/mktemp-1.5)
  * 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

emerge -O coreutils
 *  The die message:
 *   failure unpacking coreutils-6.10.tar.lzma
 
emerge -1 lzma-utils
 
emerge -O coreutils
emerge -C mktemp

quickpkg mktemp
 
emerge -C mktemp
emerge -D coreutils