$ compass compile path/to/sass/ --trace
ArgumentError on line 95 of /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb: wrong number of arguments (3 for 2)
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb:95:in `compile_if_required'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb:82:in `run'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb:80:in `each'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb:80:in `run'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb:103:in `timed'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/compiler.rb:79:in `run'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/commands/update_project.rb:36:in `perform'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/commands/base.rb:18:in `execute'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/commands/project_base.rb:19:in `execute'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/exec/sub_command_ui.rb:43:in `perform!'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/lib/compass/exec/sub_command_ui.rb:15:in `run!'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/bin/compass:25
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/bin/compass:39:in `call'
  /Library/Ruby/Gems/1.8/gems/compass-0.11.alpha.4/bin/compass:39
  /usr/local/bin/compass:19:in `load'
  /usr/local/bin/compass:19