Logstash-forwarder integration test fails

```
Failures:

1) operating when compiled from source behaves like logstash-forwarder should follow a file and emit lines as events
Failure/Error: connection.run do |event|
Errno::EAGAIN:
Resource temporarily unavailable
Shared Example Group: "logstash-forwarder" called from ./spec/lumberjack_spec.rb:102
# ./vendor/ruby/1.9.1/bundler/gems/ruby-lumberjack-3e6ac7a404e7/lib/lumberjack/server.rb:298:in `sysread'
# ./vendor/ruby/1.9.1/bundler/gems/ruby-lumberjack-3e6ac7a404e7/lib/lumberjack/server.rb:298:in `sysread'
# ./vendor/ruby/1.9.1/bundler/gems/ruby-lumberjack-3e6ac7a404e7/lib/lumberjack/server.rb:298:in `read_socket'
# ./vendor/ruby/1.9.1/bundler/gems/ruby-lumberjack-3e6ac7a404e7/lib/lumberjack/server.rb:283:in `run'
# ./spec/lumberjack_spec.rb:79:in `block (2 levels) in '
```