mark@mark-laptop:~/dev/rails-tutorial$ bundle exec guard
/usr/local/lib/ruby/gems/1.9.1/gems/ffi-1.0.11/lib/ffi.rb:11:in `require': ffi_prep_cif failed.  status=0x2 (fatal)
    from /usr/local/lib/ruby/gems/1.9.1/gems/ffi-1.0.11/lib/ffi.rb:11:in `rescue in <top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/ffi-1.0.11/lib/ffi.rb:2:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/vendor/linux/lib/rb-inotify/native.rb:1:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/vendor/linux/lib/rb-inotify/native.rb:1:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/vendor/linux/lib/rb-inotify.rb:1:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/vendor/linux/lib/rb-inotify.rb:1:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/guard/listeners/linux.rb:39:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/guard/listeners/linux.rb:39:in `usable?'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/guard/listener.rb:43:in `select_and_init'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/guard.rb:83:in `setup'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/guard.rb:180:in `start'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/lib/guard/cli.rb:75:in `start'
    from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22:in `run'
    from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:118:in `invoke_task'
    from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor.rb:263:in `dispatch'
    from /usr/local/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/base.rb:389:in `start'
    from /usr/local/lib/ruby/gems/1.9.1/gems/guard-1.0.0/bin/guard:6:in `<top (required)>'
    from /usr/local/bin/guard:19:in `load'
    from /usr/local/bin/guard:19:in `<main>'