Here's the same reult's output with --verbose.
davids-MacBook-Pro:sailing_oli_bk31mar2013pg bone_david$ gem install mysql2 --verbose -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
302 Moved Temporarily
304 Not Modified
302 Moved Temporarily
304 Not Modified
Installing gem mysql2-0.3.11
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/.gitignore
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/.rspec
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/.rvmrc
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/.travis.yml
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/CHANGELOG.md
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/Gemfile
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/MIT-LICENSE
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/README.md
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/Rakefile
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/active_record.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/active_record_threaded.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/allocations.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/escape.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/query_with_mysql_casting.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/query_without_mysql_casting.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/sequel.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/setup_db.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/benchmark/threaded.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/examples/eventmachine.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/examples/threaded.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/client.c
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/client.h
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/extconf.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/mysql2_ext.c
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/mysql2_ext.h
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/result.c
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/result.h
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/ext/mysql2/wait_for_single_fd.h
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/lib/mysql2.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/lib/mysql2/client.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/lib/mysql2/em.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/lib/mysql2/error.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/lib/mysql2/result.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/lib/mysql2/version.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/mysql2.gemspec
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/spec/em/em_spec.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/spec/mysql2/client_spec.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/spec/mysql2/error_spec.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/spec/mysql2/result_spec.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/spec/rcov.opts
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/spec/spec_helper.rb
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/tasks/benchmarks.rake
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/tasks/compile.rake
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/tasks/rspec.rake
/Users/bone_david/.rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11/tasks/vendor_mysql.rake