require paypal gem error on linux only

Hi All,

I am using the paypal gem and it is working fine on my os x dev box.
But when I deploy to linux rails dies while starting up. I've used
this code in environment.rb:
require 'paypal'

Simple enough and works fine for all the other gems I'm using. But on
linux I get the following error:

** Starting Mongrel listening at 127.0.0.1:8005
   2282 ** Starting Rails with production environment ...
   2283 /path/to/current/config/../vendor/rails/activerecord/lib/active_record/deprecated_finders.rb:13:
undefined method `deprecate' for #<Class :ActiveRecord::Base>
(NoMethodError)
   2284 from
/usr/lib/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
   2285 from
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require'
   2286 from
/path/to/current/config/../vendor/rails/activerecord/lib/active_record/base.rb:4
   2287 from
/usr/lib/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
   2288 from
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require'
   2289 from
/path/to//current/config/../vendor/rails/activerecord/lib/active_record.rb:37
   2290 from
/usr/lib/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
   2291 from
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require'
   2292 ... 11 levels...
   2293 from
/usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.3/bin/mongrel_rails:83:in
`run'
   2294 from
/usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.3/lib/mongrel/command.rb:199:in
`run'
   2295 from
/usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.3/bin/mongrel_rails:235
   2296 from /usr/bin/mongrel_rails:18

Any ideas on the correct way to load this gem? I also tried
require_gem and that didn't work either.

BTW, I'm on edge rails for both machines.

Thanks,
Sean