$ 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
How We Did It: GIF Dance Party - I remember my first introduction to the web back in the mid ’90s. It was a place of mad discovery. There was a great deal of uncertainty when clicking a li...