Please see <https://bugs.gentoo.org/show_bug.cgi?id=354205>, tkabber is completely broken in stable since February.
* ERROR: net-im/tkabber-0.9.9 failed: * dev-tcltk/tclxml-3.2-r1 does not actually support the expat USE flag! * * Call stack: * ebuild.sh, line 56: Called pkg_setup * tkabber-0.9.9.ebuild, line 36: Called built_with_use 'dev-tcltk/tclxml' 'expat' * eutils.eclass, line 1882: Called die * The specific snippet of code: * die) die "$PKG does not actually support the $1 USE flag!";; *
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