* An update to portage is available. It is _highly_ recommended
 * that you update portage now, before any other packages are updated.

 * To update portage, run 'emerge portage' now.

Traceback (most recent call last):
  File "/usr/bin/layman", line 23, in <module>
    from   layman.config            import Config
ImportError: No module named layman.config
LinuX michael # emerge portato
Calculating dependencies... done!

!!! Error: the dev-util/portatosourceview package conflicts with another package;
!!!        the two packages cannot be installed on the same system together.
!!!        Please use 'emerge --pretend' to determine blockers.

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