$ 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
A Story in Every Direction - Thanks to native support on Facebook and YouTube, virtual reality and immersive 360˚ video have reached a tipping point in which production, distribution, ...