Please file bug reports for packages that fail to build or run against dev-libs/libevent-2, and make those reports block ("Depends on") this tracker bug. NO DISCUSSION PLEASE.
Tinderbox run completed; no further build-time failures seem to be present.
Please run again with 2.0.9, any regressions due to epoll and dup2() should be fixed.
2.0.10 is "stable" now.
A quick (and sloppy) check of portage shows the following packages DEPEND on libevent. arpd beanstalkd bitlbee bmpanel chromium dnsproxy drizzle fragroute freebsd gearmand honeyd libdnsres libeventdb libgpevtype luaevent-prody memcached mysql nfs ntop nylon pecl php rp scanssh tmux tor transmission unbound xulrunner I've tested the following against libevent-2 and foundno issues: gearmand tor xulrunner I'll continue working through the list systematically and open bugs for breakage.
dev-libs/libevent-2 is no longer package.masked.
Looks like this is fixed.