Skype

Skype is a proprietary application owned by Microsoft for instant messaging, VoIP calls, and video conversations.

Emerge
Install :

Additional USE flags
To emerge Skype on the architecture, the system cannot be on a nomultilib profile. The following settings will need to be in or some equivalent.

Edit your pinentry usage in this way.

and then just install the package.

Auto-launching at KDE login
For some reason, KDE cannot remember Skype in the session it saves upon log out. This workaround will fool it into saving Skype in the session.

To make the Skype main window (but not chat windows) go to a desktop or any other features of Window Rules with KDE, use this regular expression under Window Title in the settings window:

Permissions
It is possible, that your user does not have privileges to access video device. Example privileges:

Add each Skype user to the video group:

Where  is substituted for the appropriate username.

Preload v4l1
For 64-bit environments: