KDE/Plasma 5 upgrade

Plasma 5 is the next generation of KDE's desktop environment, based on Qt 5 and KDE Frameworks 5. Upgrading is fairly simple, although it cannot be coinstalled with Plasma 4 due to upstream design decisions.

Note that while Plasma 5 is in a good state, it is still under heavy upstream development and is missing some features present in KDE 4.

Overlay (Optional)
For set and keyword support install layman and add the KDE Overlay:

Profile
It is highly recommended to use the Plasma desktop profile as it sets a number of important options to ensure things run smoothly.

In order to choose the most suitable profile, first list what's available:

Then, select the right profile, substituting the appropriate profile number (which may vary between configurations):

Any packages affected by the profile change need to be rebuilt:

Unmasking and keywording
In the following examples please adapt "/path/to/overlay/" with the actual path, this is probably: /var/lib/layman/.

Plasma 5 is currently masked. For your convenience, unmasking files are provided in the overlay:

It's also necessary to unmask the qt5 USE flag:

For stable users, you also need to keyword the required packages:

Installation
The plasma-meta package provides the full Plasma 5 suite:

Alternatively, kde-plasma/plasma-desktop provides the basic desktop, leaving you free to install only the extra packages you require:

Troubleshooting
The most common issue with upgrading is running into blockers. Unfortunately, some packages just can't be coinstalled so they'll need to be removed. Feel free to drop by #gentoo or #gentoo-kde for assistance with resolving any blockers.