Iconv available in 1.8.0-win pragprog?

Hello,

Is iconv available for windows in ruby-1.8.0 as shipped by 

rubyinstaller.sf.net?

irb(main):001:0> require 'iconv’
LoadError: No such file to load – iconv
from (irb):1:in `require’
from (irb):1

thank you.

emmanuel