==> idna (compile)
WARN: Missing plugins: [rebar3_hex]
==> mimerl (compile)
==> ssl_verify_hostname (compile)
==> certifi (compile)
WARN: Expected /home/bossyang/workspace/exrm-test/_build/dev/lib/cowboy to be an app dir (containing ebin/*.app), but no .app found.
==> hackney (compile)
WARN: Expected /home/bossyang/workspace/exrm-test/_build/dev/lib/cowboy to be an app dir (containing ebin/*.app), but no .app found.
Dependency not available: cowboy-.* ({git,
"https://github.com/ninenines/cowboy.git",
{tag,"1.0.4"}})
ERROR: compile failed while processing /home/bossyang/workspace/exrm-test/deps/hackney: rebar_abort
** (Mix) Could not compile dependency :hackney, "/home/bossyang/.mix/rebar" command failed. You can recompile this dependency with "mix deps.compile hackney", update it with "mix deps.update hackney" or clean it with "mix deps.clean hackney"
Elixir 1.1.1 Erlang/OTP 18 [erts-7.1] [source-2882b0c] [64-bit] [smp:2:2] [async-threads:10] [hipe] [kernel-poll:false] Linux hoit09-vbox 3.8.13-118.el7uek.x86_64 #2 SMP