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[C:\] ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [i386-mingw32]

[C:\] gem install bcrypt-ruby
Building native extensions.  This could take a while...
Successfully installed bcrypt-ruby-2.1.2
1 gem installed
Installing ri documentation for bcrypt-ruby-2.1.2...
Installing RDoc documentation for bcrypt-ruby-2.1.2...