# emerge -av mariadb

 * IMPORTANT: 5 news items need reading for repository 'gentoo'.
 * Use eselect news to read news items.


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

Calculating dependencies... done!
[ebuild  N     ] virtual/perl-Time-HiRes-1.972.500-r1  0 kB
[ebuild  N     ] perl-core/Term-ANSIColor-4.20.0  40 kB
[ebuild  N     ] virtual/perl-PodParser-1.610.0  0 kB
[ebuild  N     ] virtual/perl-Term-ANSIColor-4.20.0  0 kB
[ebuild  N     ] perl-core/Getopt-Long-2.410.0  42 kB
[ebuild  N     ] virtual/perl-Getopt-Long-2.410.0  0 kB
[ebuild  N     ] dev-db/mariadb-5.5.31-r1  USE="community pam perl ssl -cluster -debug -embedded -extraengine -jemalloc -latin1 -max-idx-128 -minimal -oqgraph (-pbxt) -profiling (-selinux) -sphinx -static -systemtap -tcmalloc {-test}" 28,679 kB
[blocks B      ] dev-db/mysql ("dev-db/mysql" is blocking dev-db/mariadb-5.5.31-r1)
[blocks B      ] dev-db/mariadb ("dev-db/mariadb" is blocking dev-db/mysql-5.5.30)

Total: 7 packages (7 new), Size of downloads: 28,759 kB
Conflict: 2 blocks (2 unsatisfied)

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

  (dev-db/mariadb-5.5.31-r1::gentoo, ebuild scheduled for merge) pulled in by
    mariadb
    =dev-db/mariadb-5.5*[embedded=,minimal=,static=] (=dev-db/mariadb-5.5*[-embedded,-minimal,-static]) required by (virtual/mysql-5.5::gentoo, installed)

  (dev-db/mysql-5.5.30::gentoo, installed) pulled in by
    dev-db/mysql required by @selected


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