xine-lib-1_rc0-r1 depends now on speex (http://www.speex.org). it won't compile without it installed.
Fixed in CVS. Thanks for the report!
FYI, this bug has been reintroduced in xine-lib-1_rc0-r2.ebuild (i.e., the speex dependency has disappeared). I thought CVS was supposed to take care of these kind of things?
Must have been an oversight of the other dev. Thanks for the report, again. Fixed in -r2.