"XSel is a command-line program for getting and setting the contents of the X selection. Normally this is only accessible by manually highlighting information and pasting it with the middle mouse button." Please add this package to portage. (Note that is has been distributed with the app-shells/fish package up to now and I can report it running fine on x86 and amd64.)
*** This bug has been marked as a duplicate of 55422 ***