Rails 2.1 & postgresql (Could not find adapter)

Witam!
mam problem z zainstalowaniem adaptera postgresql (ERROR: While executing gem …
Could not find activerecord-postgresql-adapter)
używam ruby 1.8.6, rails 2.1, gem 0.9.4
Wie ktos skad sciagnac ten adapter ?

PostgreSQL. Versions 7.4 and 8.x are supported.

Install the ruby-postgres driver:

gem install ruby-postgres

On Mac OS X:

gem install ruby-postgres – --include=/usr/local/pgsql

On Windows:

gem install ruby-postgres

Choose the win32 build.

Install PostgreSQL and put its /bin directory on your path.