As per summary the package in the description fails to build with libnl-2 and libnl-3. CODE: checking for nl_handle_alloc in -lnl... no configure: WARNING: keepalived will be built without libnl support. Technically it is automagic, but it just wont fail just wont link to the lib.
--- ChangeLog 2011-09-12 13:29:00.000000000 +0200 +++ ChangeLog.new 2011-10-27 18:18:06.000000000 +0200 @@ -2,6 +2,10 @@ # Copyright 1999-2011 Gentoo Foundation; Distributed under the GPL v2 # $Header: /var/cvsroot/gentoo-x86/sys-cluster/keepalived/ChangeLog,v 1.81 2011/09/10 08:53:02 scarabeus Exp $ + 27 Oct 2011; Jeroen Roovers <jer@gentoo.org> keepalived-1.2.2.ebuild, + keepalived-1.2.2-r1.ebuild: + Fix libnl dependency (bug #382473). +