An anti-spam filter using on Bayesian filtering works adding: MY_PV=${PV/_rc/rc} to the old spambayes-1.0_beta1.ebuild
I have noted in the ebuild: # removing ".1" from the work directory name S=${WORKDIR}/${MY_P/.1} It will have problems with a future version 1.1
*** This bug has been marked as a duplicate of 51522 ***