[ebuild  N    ] kde-base/kamera-3.5.8  USE="arts kdeenablefinal xinerama -debug" 0 kB 
[ebuild  N    ] media-gfx/sane-backends-1.0.18-r6  USE="gphoto2 ipv6 usb v4l -doc" 3,709 kB 
[ebuild  N    ] kde-base/libkscan-3.5.8  USE="arts kdeenablefinal xinerama -debug" 0 kB 
[ebuild  N    ] kde-base/kooka-3.5.8  USE="arts kdeenablefinal xinerama -debug" 0 kB 
[ebuild     U ] kde-base/kdegraphics-meta-3.5.8 [3.5.6] USE="gphoto2 povray scanner -imlib*" 0 kB 
[ebuild     U ] kde-base/kde-meta-3.5.8 [3.5.6] USE="accessibility nls" 0 kB 
[ebuild     U ] sys-apps/hal-0.5.10 [0.5.9-r4] USE="acpi crypt -apm% -debug -dell% -disk-partition% -doc -laptop% (-selinux) (-dmi%) (-pcmcia%*)" 1,592 kB 
[ebuild  N    ] app-misc/hal-info-20071030  150 kB 
[ebuild     U ] x11-drivers/xf86-input-evdev-1.2.0 [1.1.5-r1] USE="-debug" 254 kB 
[blocks B     ] <sys-fs/udev-114 (is blocking media-libs/libgphoto2-2.4.0-r1, media-gfx/sane-backends-1.0.18-r6)
[blocks B     ] <sys-fs/udev-115-r1 (is blocking sys-fs/device-mapper-1.02.22-r5)
[blocks B     ] net-dns/avahi (is blocking net-misc/mDNSResponder-107.6-r5)
[blocks B     ] x11-misc/xkbdata (is blocking x11-misc/xkeyboard-config-1.1)
[blocks B     ] >=sys-apps/util-linux-2.13_pre (is blocking sys-process/schedutils-1.5.0)
[blocks B     ] media-libs/libdts (is blocking media-libs/libdca-0.0.5)
[blocks B     ] media-plugins/libao-pulse (is blocking media-libs/libao-0.8.8)
[blocks B     ] <sys-fs/device-mapper-1.02.19-r1 (is blocking sys-fs/udev-118)
[blocks B     ] x11-misc/xkeyboard-config (is blocking x11-misc/xkbdata-1.0.1)
[blocks B     ] net-misc/mDNSResponder (is blocking net-dns/avahi-0.6.22-r1)
[blocks B     ] <sys-apps/baselayout-2.0.0_rc (is blocking sys-apps/makedev-3.23.1)
[blocks B     ] sys-process/schedutils (is blocking sys-apps/util-linux-2.13.1)
[blocks B     ] app-crypt/libgssapi (is blocking net-libs/libgssglue-0.1)
[blocks B     ] <=x11-libs/wxGTK-2.6.4.0-r2 (is blocking app-admin/eselect-wxwidgets-0.7-r1)

Total: 927 packages (620 upgrades, 1 downgrade, 295 new, 11 in new slots, 14 blocks), Size of downloads: 1,151,128 kB
Portage tree and overlays:
 [0] /usr/portage
 [1] /usr/portage/local/layman/sabayon

!!! 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