look this....
http://forums.gentoo.org/viewtopic-t-713051.html?sid=e44c9527cf38ebd470151d1452478d82

On Sun, Nov 9, 2008 at 1:01 PM, Stroller <stroller@stellar.eclipse.co.uk>wrote:

>
> On 9 Nov 2008, at 04:09, John covici wrote:
>
> In my latest update I have received the following message:
>> !!! Multiple versions within a single package slot have been pulled
>> !!! into the dependency graph, resulting in a slot conflict:
>>
>> media-libs/win32codecs:0
>>
>>  ('installed', '/', 'media-libs/win32codecs-20071007-r4', 'nomerge')
>>  pulled in by
>>   ('installed', '/', 'media-libs/realcodecs-11.0.1.1056', 'nomerge')
>>   @world
>>
>>  ('ebuild', '/', 'media-libs/win32codecs-20071007-r4', 'merge')
>>  pulled in by
>>   ('ebuild', '/', 'media-video/vlc-0.9.6', 'merge')
>>   ('ebuild', '/', 'media-video/mplayer-1.0_rc2_p27725-r1', 'merge')
>>   @world
>>
>>
>> ...
>> Are they doing some kind of strange reorg or what?  HOw can I fix
>> this?
>>
>
> I believe so:
> http://forums.gentoo.org/viewtopic-t-713051.html
>
> I'm guessing that it's this that's causing the problems you describe above.
> You mentioned package unmasking, and this is recommended in the referenced
> forums post for those that require Real, but you might just try unmerging
> win32codecs & realcodecs & trying your update again.
>
> I discovered this reorganisation because updating my system showed mplayer
> updating with the real USE flag being forcibly disabled, i.e.:
> [ebuild     U ] media-video/mplayer-1.0_rc2_p27725-r1 [1.0_rc2_p26753-r1]
> USE="...  -radio (-real*) -rtc ... " 0 kB
> Someone on #gentoo was able to help because they'd experienced the issue
> this morning.
>
> It's not clear to me from this post whether Realplayer & these codecs are
> actually needed by mplayer in order to play .rm & .ram playlists & audio
> files. One would assume so, except for beandog's statement "Chances are, you
> don't need them anyway. The codecs are hardly used anymore, and most people
> will be fine without them."
>
> I have been thinking recently to record Pete Tong & the other Friday /
> Saturday night Radio 1 DJs using cron & mplayer, so I can burn their shows
> to CD-R & listen to them in the car during the week. As a consequence later
> tonight I will be testing mplayer's ability to handle
> http://www.bbc.co.uk/radio1/realaudio/media/r1live.ram without these
> packages installed.
>
> Stroller.
>
>


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