Why do I get a bcrypt-ruby gem install error?

Question

Getting an error when trying to install the gem devise, the installation is stopping on the gem bcrypt-ruby:

$ gem install bcrypt-ruby
Error installing bcry         


        

Answer 1

I'm using RVM & I kept having this issue whenever installing gems with native extensions (bcrypt-ruby, bson-ext, json, eventmachine, nokogiri, linecache19, etc.)

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

Only way I could finally get things working was to uninstall then re-install ruby.

rvm remove 1.9.2

rvm install 1.9.2

Thanks to tip from @doublebee here: https://github.com/flori/json/issues/78#issuecomment-1499920