+ tokyocabinet for "tc" DB adaptor
+ http://1978th.net/tokyocabinet/
+ you can install Ruby bindings via "gem install tokyocabinet",
+ but this still requires libtokyocabinet to be installed system-wide
+ you can install those requirement in debian like this:
+ sudo aptitude install libtokyocabinet9 libtokyocabinet-dev zlib1g-dev libbz2-dev
+ sqlite3 for "sqlite" DB adaptor
+ install with gem install sqlite,
+ this also requires development libraries on the system to be present.
+ mechanize install it using gem install mechanize
+
+Useful but fallback provided
+ ruby-gettext 1.8.0+ http://www.yotabanana.com/hiki/ruby-gettext.html?ruby-gettext
+ optional; if installed rbot can use localized messages
+ htmlentities http://htmlentities.rubyforge.org/
+ optional; if installed rbot will use it to decode
+ HTML entities; if missing, an internal table with
+ the most common HTML entities will be used instead
+ hpricot http://code.whytheluckystiff.net/hpricot/
+ optional, if installed rbot will used it to find
+ the first paragraph in HTML files; if missing,
+ regular expressions will be used instead
+