[gentoo-user] world update refuses to update xorg-server, works fine with manual emerge

[Nikos Chantziaras]

When I run:

   emerge -uDNl --with-bdeps=y @world

I get this:

   WARNING: One or more updates/rebuilds have been skipped due to a
   dependency conflict:

   x11-base/xorg-server:0

     (x11-base/xorg-server-1.16.0.901:0/1.16.0.901::gentoo, ebuild
     scheduled for merge) conflicts with
       x11-base/xorg-server:0/1.15.1= required by (x11-drivers/xf86-
       input-evdev-2.8.4:0/0::gentoo, installed)

and xorg-server is not updated at all. I didn't even know that there's 
newer versions in portage. I'm on 1.15.1 and been running that for a 
long time now, but there's 1.15.2, 1.16.0 and 1.16.1 available. If I do:

   emerge -1 =xorg-server-1.16.1

then it works just fine and it gets updated. But with a @world update, nope.

What's causing this?