Gem.source_index is deprecated, use Specification. Should I re-install Gem or Rails?
Solution 1:
This worked for me: downgrade rubygems:
gem update --system 1.6.2
found this advice at: Gem.source_index is deprecated, use Specification #34
Solution 2:
Try this:
sudo gem update bundler
This will update bundler to most recent version (currently 1.0.15). This will not generate the warning or at least in my case this was the cause of the warning.