Fatal error installing syslog-ng in Papertrail recipe

[sauy7]

Here's the relevant output from the log:

/usr/local/ey_resin/ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': iconv will be deprecated in the future, use String#encode instead. ================================================================================
Error executing action `install` on resource 'package[app-admin/syslog-ng]'
================================================================================
Chef::Exceptions::Exec ---------------------- 
emerge -g --color n --nospinner --quiet =app-admin/syslog-ng-3.3.5 returned 1, expected 0 
Resource Declaration: --------------------- 
# In /etc/chef-custom/recipes/cookbooks/papertrail/recipes/default.rb 
42: package 'app-admin/syslog-ng' do 
43: version PAPERTRAIL_CONFIG[:syslog_ng_version] 
44: action :install 
45: end 
46: Compiled Resource: ------------------ 
# Declared in /etc/chef-custom/recipes/cookbooks/papertrail/recipes/default.rb:42:in `from_file' 
package("app-admin/syslog-ng") do 
  action [:install] 
  retries 0 
  retry_delay 2 
  package_name "app-admin/syslog-ng" 
  version "3.3.5" 
  cookbook_name :papertrail 
  recipe_name "default"
end 

...

[2013-06-15T07:56:13+00:00] INFO: Processing execute[get-latest-portage] action run (papertrail::default line 32) 
[2013-06-15T07:56:14+00:00] INFO: execute[get-latest-portage] ran successfully 
[2013-06-15T07:56:14+00:00] INFO: Processing file[unmasking app-admin/syslog-ng-3.3.5] action create (papertrail::default line 9) 
[2013-06-15T07:56:14+00:00] INFO: Processing ruby_block[append-to-/etc/portage/package.keywords/local] action create (papertrail::default line 28) 
[2013-06-15T07:56:14+00:00] INFO: Processing file[overriding hard mask for app-admin/syslog-ng-3.3.5] action create (papertrail::default line 9) 
[2013-06-15T07:56:14+00:00] INFO: Processing ruby_block[append-to-/etc/portage/package.unmask/engineyard_overrides] action create (papertrail::default line 28) [2013-06-15T07:56:14+00:00] INFO: Processing package[app-admin/syslog-ng] action install (papertrail::default line 42) 
[2013-06-15T07:56:16+00:00] ERROR: Running exception handlers [2013-06-15T07:56:16+00:00] ERROR: Exception handlers complete 
[2013-06-15T07:56:16+00:00] FATAL: Stacktrace dumped to /etc/chef-custom/recipes/chef-stacktrace.out 
[2013-06-15T07:56:16+00:00] FATAL: Chef::Exceptions::Exec: package[app-admin/syslog-ng] (papertrail::default line 42) had an error: Chef::Exceptions::Exec: emerge -g --color n --nospinner --quiet =app-admin/syslog-ng-3.3.5 returned 1, expected 0