C:\Tools\DevKit>gem install rdiscount --platform=ruby
ERROR: Could not find a valid gem 'rdiscount' (>= 0) in any repository
ERROR: Possible alternatives: rdiscount
C:\Tools\DevKit>gem install --http-proxy http://127.0.0.1:5865 rdiscount --platform=ruby
Fetching: rdiscount-1.6.8.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
Successfully installed rdiscount-1.6.8
1 gem installed
Installing ri documentation for rdiscount-1.6.8...
Installing RDoc documentation for rdiscount-1.6.8...