My bundler gripe

# Bundler doesn't seem to work with gems that have native extensions 
# in 1.9.x unless they were installed beforehand. A problem when
# thinking about cloud deployments with fresh instances.

myapp$ rvm use system
=> Now using system ruby
myapp$ bundle install # Gems with native extensions are already installed for this ruby version
=> ... Your bundle is complete!
myapp$ rake
=> ... green
myapp$ rvm install ruby-head
=> ... ruby head installed
myapp$ rvm use ruby-head
=> Using ruby head
myapp$ bundle install 
=> Your bundle is complete!
myapp$ rake
=> ... Seg fault on a gems with native extensions
myapp$ gem install (gems with native extensions)
=> ... gems installed
myapp$ bundle install
=> ... Your bundle is complete!
myapp$ rake
=> ... green