Sometimes when you want to emerge something or upgrade something you will have dependency slot conflicts like this example.

To fix this problem you'd need to emerge all kde-frameworks/* packages you currently have installed to upgrade them all at once since it's all part of one framework.

The following commands let you do so with ease.

equery l kde-frameworks/* -F '$category/$name'

The output of which you can send right into emerge like so.

sudo emerge --ask -1 --verbose-conflicts $(equery l kde-frameworks/* -F '$category/$name')

Now you'll hopefully get a clean emerge.