[Rails] sqlite3-ruby-1.2.5 is cached?

I had Rails --version 3.0.0.beta3 installed. When I try to start the
server I get a message, "sqlite3-ruby-1.2.5 is cached, but not
installed. Try running 'bundle install'. When I run the bundle install
the following message below appears:

#######
Installing sqlite3-ruby (1.2.5) from .gem files at
/Users/john.ranaudo/.bundle/ruby/1.8/cache
with native extensions
/Library/Ruby/Site/1.8/rubygems/installer.rb:482:in `build_extensions':
ERROR: Failed to build gem native extension.
(Gem::Installer::ExtensionBuildError)

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
extconf.rb
mkmf.rb can't find header files for ruby at
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h

Gem files will remain installed in
/Users/john.ranaudo/.bundle/ruby/1.8/gems/sqlite3-ruby-1.2.5 for
inspection.
Results logged to
/Users/john.ranaudo/.bundle/ruby/1.8/gems/sqlite3-ruby-1.2.5/ext/sqlite3_api/gem_make.out
#######

Any thoughts on how to resolve this?

Thanks,
John
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