[TxMt] setting paths in TextMate

I installed ruby 1.8.5 and appscript on my mac (and it is hugely better that the schizolanguage of AppleScript).

Now if I define a command in TextMate like

#!/usr/bin/env ruby require "appscript" include Appscript te = app('TextEdit')

TextMate complains it (he) cannot find appscript.rb (no use to give the explicit path since then TextMate cannot find the files require'd inside appscript, etc etc).

Clearly, I must set new paths, but how? and maybe I should also tell TextMate to use 1.8.5 instead of 1.8.2 I'm sure this is easy but have no idea how to do it. Any help?

Thanks a lot, Piero