~/opt/ruby-1.8.7-p174/lib/ruby/1.8/i686-darwin9.8.0/readline.bundle:
    dlopen(~/opt/ruby-1.8.7-p174/lib/ruby/1.8/i686-darwin9.8.0/readline.bundle, 9):
          Symbol not found: _rl_filename_completion_function (LoadError)
Referenced from: ~/opt/ruby-1.8.7-p174/lib/ruby/1.8/i686-darwin9.8.0/readline.bundle
Expected in: flat namespace
[rest deleted because everyone's seen it]

~/opt/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/completion.rb:9:in `require':
  dlopen(~/opt/ruby-1.9.2-p0/lib/ruby/1.9.1/i386-darwin9.8.0/readline.bundle, 9):
    Symbol not found: _rl_editing_mode (LoadError)
Referenced from: ~/opt/ruby-1.9.2-p0/lib/ruby/1.9.1/i386-darwin9.8.0/readline.bundle
Expected in: flat namespace