ejabberd 16.04 does not work with erlang 19. When an attempt is made to do so, this error is logged in /var/log/jabber/ejabberd.log: --- 2016-07-07 17:53:11.904 [error] <0.625.0> CRASH REPORT Process <0.625.0> with 0 neighbours crashed with reason: call to undefined function gen:debug_options([{max_queue,1000}]) --- ejabberd will not work at all. Upstream issue: https://github.com/processone/ejabberd/issues/1176
Here's a pull request that adds a dependency on <dev-lang/erlang-19 https://github.com/gentoo/gentoo/pull/1845
Thank you!