emerge -pv emerald emerald-themes
Calculating dependencies... done!
[ebuild  N    ] x11-libs/libxklavier-3.3  USE="-doc" 
[ebuild  N    ] kde-base/kdebase-pam-7  
[ebuild  N    ] x11-apps/xsetroot-1.0.2  USE="-debug" 
[ebuild  N    ] sys-devel/gdb-6.7.1  USE="nls -test -vanilla" 
[ebuild  N    ] media-plugins/gst-plugins-meta-0.10  USE="X alsa oss xv -esd" 
[ebuild  N    ] kde-base/kdebase-3.5.8-r6  USE="cups hal ldap opengl pam xcomposite -arts -branding -debug -ieee1394 -java -joystick -kdeenablefinal -kdehiddenvisibility -lm_sensors -logitech-mouse -openexr -samba -xinerama -xscreensaver" 
[ebuild  N    ] gnome-base/libgnomekbd-2.20.0  USE="-debug" 
[ebuild  N    ] gnome-base/control-center-2.20.3  USE="alsa hal -debug -eds -esd" 
[ebuild  N    ] x11-wm/compiz-0.6.2-r1  USE="dbus gnome kde -debug -svg" 
[ebuild  N    ] x11-wm/emerald-0.5.2  USE="-debug" 
[ebuild  N    ] x11-themes/emerald-themes-0.5.2  
[blocks B     ] =kde-base/konqueror-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kicker-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kcontrol-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kdesu-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kdebase-data-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kfind-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/libkonq-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/khelpcenter-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kdebase-3.5* (is blocking kde-base/khotkeys-3.5.8, kde-base/khelpcenter-3.5.8, kde-base/libkonq-3.5.8, kde-base/kdebase-data-3.5.8, kde-base/kfind-3.5.8, kde-base/kicker-3.5.8, kde-base/kdebase-kioslaves-3.5.8, kde-base/kdesu-3.5.8, kde-base/konqueror-3.5.8, kde-base/kcontrol-3.5.8-r2, kde-base/kdialog-3.5.8, kde-base/kcminit-3.5.8)
[blocks B     ] =kde-base/kdebase-kioslaves-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/khotkeys-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kcminit-3.5* (is blocking kde-base/kdebase-3.5.8-r6)
[blocks B     ] =kde-base/kdialog-3.5* (is blocking kde-base/kdebase-3.5.8-r6)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

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