$ sudo gem install passenger
$ sudo passenger-install-apache2-module
and then…
--------------------------------------------
The Apache 2 module was successfully installed.
Please edit your Apache configuration file, and add these lines:
LoadModule passenger_module /usr/local/lib/ruby/gems/1.8/gems/passenger-2.0.3/ext/apache2/mod_passenger.so
PassengerRoot /usr/local/lib/ruby/gems/1.8/gems/passenger-2.0.3
PassengerRuby /usr/local/bin/ruby
…or something like that
$ sudo vim /etc/apache2/httpd.conf
…or mate or nano, paste the code at the bottom…
$ sudo apachectl graceful
…then get the Mac OS X Preference Pane from the Fingertips blog…
$ curl -O http://www.fngtps.com/files/2/2008/06/PassengerPrefPane-1.0.zip
…unzip and install it, add your apps. presto!