emerge --update --deep --newuse -va world

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

Calculating world dependencies... done!
[ebuild   R   ] kde-base/kdelibs-3.5.5-r5  USE="alsa arts cups fam spell ssl tiff -acl -debug -doc -jpeg2k -kdeenablefinal -kerberos -legacyssl -lua -openexr -pertty% -utempter -xinerama -zeroconf (-kdehiddenvisibility%*)" LINGUAS="-he" 0 kB [3]
[ebuild   R   ] x11-libs/cairo-1.2.4  USE="X glitz pdf%* png svg -directfb -doc -newspr%" 0 kB [3]
[ebuild   R   ] kde-base/konsole-3.5.5  USE="arts -debug -kdeenablefinal -transparency% -xinerama (-kdehiddenvisibility%*)" 0 kB [4]