$ macirb

irb(main):001:0> require 'net/http'

LoadError: no such file to load -- socket.rb.bundle

from /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/net/protocol.rb:21:in `require'

from /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/net/protocol.rb:21:in `<top (required)>'

from /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/net/http.rb:28:in `require'

from /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/net/http.rb:28:in `<top (required)>'

from (irb):1:in `require'

from (irb):1

from /usr/local/bin/macirb:12:in `<main>'

But I have socket.bundle in /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/universal-darwin9.5