With introduction of postgresql-9.5 slony1 ebuild should be modified as well to allo installation with postgresql-9.5 Reproducible: Always
According to https://git.postgresql.org/gitweb/?p=slony1-engine.git;a=commit;h=30fbf4a66057da1b8148bbf3a4d2220011bda8d0 postgresql-9.5 server is available in slony1-2.2.5
Interestingly, I'm running 2.2.4 with postgresql-9.5.3 and it's working just fine... not sure what the compatibility additions are in 2.2.5.
Available at barzog-overlay
commit d89ba12f0d45d7e2bcbc3b582101dc01314715a6 author: aaron w. swenson <titanofold@gentoo.org> date: fri oct 7 14:00:55 2016 -0400 dev-db/slony1: version bump added 9.5 and 9.6 as suitable dependencies. bugs: 584778 package-manager: portage-2.2.28