From the Terminal
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.