I just updated the portage tree. But there seems to be a dependency conflict
when I try to update the system. This is the first time I encounter this
kind of problem. Could you guys help me out? Thanks in advance^_^

-------------------

$ sudo emerge -avuDN world

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

Calculating dependencies... done!
[ebuild  NS   ~] sys-kernel/gentoo-sources-2.6.39-r1 [2.6.39] USE="-build
-deblob -symlink" 72 kB
[ebuild     U  ] dev-libs/libdbusmenu-qt-0.8.2 [0.6.2] USE="-debug -doc%
-test" 36 kB
[ebuild     U ~] sys-fs/udev-171-r1 [151-r4] USE="acl%* gudev%* hwdb%*
keymap%* rule_generator%* -action_modeswitch% -debug% -edd% -floppy%
(-introspection) (-selinux) -test (-devfs-compat%)
(-extras%*) (-old-hd-rules%)" 595 kB
[ebuild     U  ] net-ftp/lftp-4.2.3 [4.1.3] USE="nls ssl -gnutls -socks5"
1,296 kB
[ebuild     U ~] media-sound/pulseaudio-0.9.22-r2 [0.9.22] USE="X alsa
asyncns bluetooth caps dbus glib ipv6 tcpd udev -avahi -doc -gnome -jack
-libsamplerate -lirc (-oss) -realtime
(-system-wide) -test" 0 kB
[ebuild     U ~] sys-fs/udisks-1.0.2-r4 [1.0.2-r1] USE="nls -bash-completion
-debug -doc -remote-access" 0 kB

Total: 6 packages (5 upgrades, 1 in new slot), Size of downloads: 1,997 kB

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

sys-fs/udev:0

  (sys-fs/udev-171-r1::gentoo, ebuild scheduled for merge) pulled in by
    >=sys-fs/udev-171[hwdb] required by
(media-sound/pulseaudio-0.9.22-r2::gentoo, ebuild scheduled for merge)

  (sys-fs/udev-151-r4::gentoo, installed) pulled in by
    >=sys-fs/udev-147[extras] required by (sys-fs/udisks-1.0.2-r4::gentoo,
ebuild scheduled for merge)
    (and 3 more with the same problem)


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. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

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


-- 
Best Regards,
Einux

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