Skype

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

Emerge
Install :

Using apulse
To avoid installing pulseaudio, install instead which will emulate pulseaudio enough for Skype to work. To emerge apulse on the architecture switch to a multilib profile. apulse needs a multilib version of ALSA and can not be installed simultaneously with.

Alias to  if apulse will be used:

Auto-launching at KDE login
For some reason, KDE cannot remember Skype in the session it saves upon log out. This is my current workaround.

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: crw-rw+ 1 root video 81, 0 Nov 25 22:03 /dev/video0
 * 1) ls -al /dev/video0

Add each Skype user to the video group:

Where  is substituted for the appropriate username.

Preload v4l1
For 64-bit:

$ LD_PRELOAD=/usr/lib32/libv4l/v4l1compat.so skype