[ebuild  NS   ] sys-devel/gcc-4.2.3  USE="fortran gcj mudflap nls openmp (-altivec) -bootstrap -build -doc -gtk (-hardened) -ip28 -ip32r10k -libffi (-multilib) -multislot (-n32) (-n64) -nocxx -objc -objc++ -objc-gc -test -vanilla"
[ebuild     U ] app-admin/perl-cleaner-1.05 [1.04.3]
[ebuild     U ] app-misc/ca-certificates-20070303-r1 [20061027.2]
[ebuild     U ] app-admin/eselect-1.0.11 [1.0.9] USE="-vim-syntax%"
[ebuild     U ] dev-libs/apr-util-1.2.12 [1.2.8] USE="-doc% -mysql%"
[ebuild     U ] dev-util/subversion-1.4.6 [1.4.3] USE="-debug% -doc% -extras% -svnserve% -vim-syntax%"
[ebuild   R   ] app-admin/equo-9999-r4
[blocks B     ] sys-apps/mktemp (is blocking sys-apps/coreutils-6.10-r1)
[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