god ~ # emerge -uavDN world
These are the packages that would be merged, in order:
Calculating world dependencies... done!
[blocks B ] sys-apps/coldplug (is blocking sys-fs/udev-103)
[blocks B ] >=sys-fs/udev-089 (is blocking sys-apps/coldplug-20040920-r1)
[ebuild U ] sys-apps/portage-2.1.1-r2 [2.1.1-r1] USE="-build -doc (-selinux)" LINGUAS="-pl" 5 kB
*** Portage will stop merging at this point and reload itself,
then resume the merge.
[ebuild N ] virtual/mysql-5.0 0 kB
[ebuild U ] sys-fs/udev-103 [087-r1] USE="(-selinux)" 195 kB
[ebuild NS ] sys-kernel/gentoo-sources-2.6.18-r3 USE="-build -symlink (-ultra1)" 228 kB
[ebuild U ] net-nds/openldap-2.3.27-r3 [2.3.27-r2] USE="berkdb crypt gdbm ipv6 perl readline sasl ssl tcpd -debug -kerberos -minimal -odbc -overlays -samba (-selinux) -slp -smbkrb5passwd" 0 kB
[ebuild NS ] dev-db/phpmyadmin-2.9.1.1 USE="vhosts" 1,509 kB
Total size of downloads: 1,938 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