emerge -p kdebase-kioslaves
These are the packages that I would merge, in order:
Calculating dependencies ...done!
[ebuild N ] net-dns/libidn-0.5.17
[ebuild N ] kde-base/kdelibs-3.4.1-r2
[ebuild N ] kde-base/kdialog-3.4.1
[ebuild N ] dev-libs/cyrus-sasl-2.1.21-r1
[ebuild N ] kde-base/kdebase-kioslaves-3.4.1-r1
I don't use kde, but as you can see I do not have them block, check your make.conf or the block packages perhaps you forgot to insert you arch. I know i did that once.