Any idea how to fix this?
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /home/durrantm/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
open terminal, go to project directory and remove Gemfile.lock using
rm Gemfile.lock
to remove Gemfile.lock and run
bundle install
which will create new Gemfile.lock so its easy to do it :)
worked for me.