mysql2psql fails on mac os x 10.7.4

[aruld]

arul:test arul$ mysql2psql
/Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/../lib/mysql2psql/mysql_reader.rb:18: (eval):1: uninitialized constant Mysql::Field (NameError)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in eval' from /Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/../lib/mysql2psql/mysql_reader.rb:18 from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:ininject'
from /Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/../lib/mysql2psql/mysql_reader.rb:17:in each' from /Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/../lib/mysql2psql/mysql_reader.rb:17:ininject'
from /Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/../lib/mysql2psql/mysql_reader.rb:17
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:inrequire'
from /Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/../lib/mysql2psql.rb:5
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:inrequire'
from /Library/Ruby/Gems/1.8/gems/mysql2psql-0.1.0/bin/mysql2psql:5
from /usr/bin/mysql2psql:19:in `load'
from /usr/bin/mysql2psql:19

[maxlapshin]

install mysql gem