Installing MSSQL Adapter for Ruby on Rails fails

I run this command:

gem install activerecord-sqlserver-adapter --source=http://gems.rubyonrails.org

and it fail开发者_开发百科s with

ERROR: Could not find a valid gem 'activerecord-sqlserver-adapter' (>= 0) in any repository

How can I install the Microsoft SQL Server adapter?

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Remove the source, and it works:

gem install activerecord-sqlserver-adapter

Cheers!