jruby -S gem install sinatra
/usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/requirement.rb:72:in `parse': Illformed requirement [">= 0"] (ArgumentError)
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/requirement.rb:96:in `initialize'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/requirement.rb:96:in `map!'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/requirement.rb:96:in `initialize'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/requirement.rb:53:in `new'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/requirement.rb:53:in `default'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/specification.rb:1191
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/specification.rb:8:in `require'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/source_index.rb:8
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems/source_index.rb:1079:in `require'
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems.rb:1079
	from /usr/lib/jruby//lib/ruby/site_ruby/1.8/rubygems.rb:8:in `require'
	from /usr/lib/jruby/bin/gem:8