Check out the nessus-core-1.2.4.ebuild. It requires =net-analyzer/libnasl-1.2.3. This in turn will require nessus-libraries-1.2.3. This is a bit of a problem.. Fix? s/libnasl-1.2.3/libnasl-1.2.4/ in nessus-core-1.2.4.ebuild. I implemented this fix manually and it works as expected.
fixed in cvs