$ sudo gem sources -r http://gems.datamapper.org
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR: While executing gem ... (Gem::RemoteSourceException)
HTTP Response 404 fetching http://gems.datamapper.org/yaml
$ sudo nano ~/.gemrc
Raptor: A Forthcoming Ruby Web Server for Faster App Deployment - Raptor bills itself as a new Ruby "app server” and it claims to blow everything else out of the water performance-wise (by between 2-4x!) whether that’s ...