# /usr/local/bin/gem20 build --force jquery-rails-2.2.1.gemspec --debug
Exception `NameError' at /usr/local/lib/ruby/site_ruby/2.0/rubygems/command_manager.rb:177 - uninitialized constant BuildCommand
Exception `ArgumentError' at /usr/local/lib/ruby/site_ruby/2.0/rubygems/specification.rb:579 - invalid byte sequence in US-ASCII
ERROR:  While executing gem ... (ArgumentError)
    invalid byte sequence in US-ASCII
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/specification.rb:579:in `normalize_yaml_input'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/specification.rb:491:in `from_yaml'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/commands/build_command.rb:44:in `block in load_gemspec'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/commands/build_command.rb:42:in `open'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/commands/build_command.rb:42:in `load_gemspec'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/commands/build_command.rb:26:in `execute'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/command.rb:278:in `invoke'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/command_manager.rb:147:in `process_args'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/command_manager.rb:117:in `run'
        /usr/local/lib/ruby/site_ruby/2.0/rubygems/gem_runner.rb:65:in `run'
        /usr/local/bin/gem20:30:in `<main>'
#