I recently switched from fink to Macports and reinstalled a bunch of stuff, including Ruby and Ruby Gems. Ruby works fine on the system: I can run "ruby", "irb", "gems", and "env ruby". (This is the Macports install, so all Ruby binaries are now in /opt/local/bin.) However, When I try to compile a LaTeX file from inside Textmate I get the following error:

env: ruby: No such file or directory

Presumably Textmate is still looking for my old version of Ruby. Where can I change this setting?