rspec users - Apr 2008 - TextMate bundle not using environment variable to find Ruby library

Something is going on in my TextMate bundle--it''s calling the wrong lib
for Ruby.  I have the environment variables set like
this:
>
> TM_RSPEC_HOME /usr/local/lib/ruby/gems/1.8/gems/rspec-1.1.3
> TM_RUBY  /usr/local/bin/ruby

When I run these queries in a TextMate window I get this:
> which ruby
> /usr/local/bin/ruby
> which rails
> /usr/local/bin/rails

But still when I try to run a spec in TextMate, I get this:
> /usr/lib/ruby/site_ruby/1.8/rubygems.rb:377:in 
> `report_activate_error'': Could not find RubyGem rails (>= 0) 
> (Gem::LoadError) from
> /usr/lib/ruby/site_ruby/1.8/rubygems.rb:309:in `activate'' from
> /usr/lib/ruby/site_ruby/1.8/rubygems.rb:76:in 
> `active_gem_with_options'' from
> /usr/lib/ruby/site_ruby/1.8/rubygems.rb:50:in `gem'' from
> /Users/lisasawin/Rails Web Applications/CHC/config/boot.rb:39 from
> /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
> `gem_original_require'' from
> /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require''
> from /Users/lisasawin/Rails Web Applications
> /CHC/config/environment.rb:11 from
> /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
> `gem_original_require'' ... 15 levels... from
> /Users/lisasawin/Library/Application 
>
Support/TextMate/Bundles/RSpec.tmbundle/Support/lib/spec/../spec/mate/runner.rb:31:in
> `chdir'' from
> /Users/lisasawin/Library/Application 
>
Support/TextMate/Bundles/RSpec.tmbundle/Support/lib/spec/../spec/mate/runner.rb:31:in
> `run'' from
> /Users/lisasawin/Library/Application 
>
Support/TextMate/Bundles/RSpec.tmbundle/Support/lib/spec/../spec/mate/runner.rb:14:in
> `run_file'' from /tmp/temp_textmate.zQ2Hv1:4
How can I get TextMate to use the library in usr/local/bin/ruby instead 
of looking in usr/local/bin/ruby?  Thanks so much for any help!

Lisa