since yesterday I got by emerge --auvD system: Calculating world dependencies .... done! [ebuild U ] media-libs/libpng-1.2.26-r1 [1.2.25] 489 kB [ebuild U ] dev-libs/mpfr-2.3.1 [2.3.0_p4] 869 kB [ebuild U ] net-misc/rsync-2.6.9-r6 [2.6.9-r5] USE="acl ipv6 -static -xinetd" 0 kB [ebuild U ] sys-devel/automake-1.10.1 [1.10] 897 kB [ebuild U ] dev-libs/libxml2-2.6.31 [2.6.30-r1] USE="ipv6 python readline -bootstrap -build -debug -doc -examples% -test" 4,624 kB [ebuild U ] app-text/poppler-0.6.3 [0.6.1-r1] USE="jpeg zlib -cjk" 1,263 kB [ebuild U ] sys-apps/coreutils-6.10-r1 [6.9-r1] USE="acl nls (-selinux) -static -vanilla% -xattr" 3,670 kB [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) Total: 7 packages (7 upgrades, 2 blocks), Size of downloads: 11,809 kB !!! Error: The above package list contains packages which cannot be installed !!! at the same time on the same system. Reproducible: Always Steps to Reproduce: 1. emerge --auvD system 2. 3.
duplicate of bug 207118
Unmerge sys-apps/mktemp, emerge -1 coreutils, presto. This is basic knowledge of how portage works. Packages blocking other packages is a feature, not a bug.