localhost prudvi # emerge -upNv world

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

Calculating world dependencies |
!!! Multiple versions within a single package slot have been
!!! pulled into the dependency graph:

('ebuild', '/', 'sys-kernel/linux-headers-2.6.19.2-r2', 'merge') pulled in by
  ('ebuild', '/', 'media-video/mplayer-1.0.20070427', 'merge')

('installed', '/', 'sys-kernel/linux-headers-2.6.21', 'nomerge') pulled in by
  ('ebuild', '/', 'net-misc/openvpn-2.0.7-r2', 'merge')
  ('ebuild', '/', 'sys-apps/raidutils-0.0.6-r1', 'merge')

It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in the
dependencies of two different packages, then those packages can not be
installed simultaneously.

For more information, see MASKED PACKAGES section in the emerge man page
or refer to the Gentoo Handbook.


!!! Ebuilds for the following packages are either all
!!! masked or don't exist:
net-www/gentoo-webroot-default

... done!
!!! A file is not listed in the Manifest: '/usr/portage/dev-python/PyQt4/PyQt4-4.0.ebuild'
Traceback (most recent call last):
  File "/usr/bin/emerge", line 5530, in ?
    retval = emerge_main()
  File "/usr/bin/emerge", line 5525, in emerge_main
    myopts, myaction, myfiles, spinner)
  File "/usr/bin/emerge", line 4936, in action_build
    mydepgraph.display(
  File "/usr/bin/emerge", line 2454, in display
    pkgsettings.setcpv(pkg_key, mydb=portdb)
  File "/usr/lib/portage/pym/portage.py", line 1682, in setcpv
    pkginternaluse = " ".join([x[1:] \
  File "/usr/lib/portage/pym/portage.py", line 5889, in aux_get
    raise KeyError(mycpv)
KeyError: 'dev-python/PyQt4-4.2'