Get Merb
Install the gem
$ sudo gem install merb --include-dependencies
Or install from source
If you feel like living on the edge, or you want to contribute with some code or documentation.
Check out the source
$ git clone git://github.com/wycats/merb-core.git
$ git clone git://github.com/wycats/merb-more.git
Install Gem Dependencies
$ sudo gem install erubis rake json_pure rspec rack hpricot mime-types
Generate and install the gems
$ cd merb-core ; rake install ; cd ..
$ cd merb-more ; rake install ; cd ..