>> require "hpricot"
=> true
>> Hpricot('').build
NoMethodError: undefined method `build' for #<Hpricot::Doc>
from (irb):2
>> doc = Hpricot('') {}
=> #<Hpricot::Doc>
>> doc.build
ArgumentError: block not supplied
from /usr/local/ruby-1.8.7/lib/ruby/gems/1.8/gems/hpricot-0.8.2/lib/hpricot/builder.rb:19:in `instance_eval'
from /usr/local/ruby-1.8.7/lib/ruby/gems/1.8/gems/hpricot-0.8.2/lib/hpricot/builder.rb:19:in `build'
from /usr/local/ruby-1.8.7/lib/ruby/gems/1.8/gems/hpricot-0.8.2/lib/hpricot/builder.rb:121:in `build'
from (irb):4
>> doc.build {}
=> #<Hpricot::Doc>
