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