In Podfile add LinqToObjectiveC. Tutorial shows version 2.0.0, but this didn't work. So use previous version 1.1.0.

Also the tutorial shows ReactiveCocoa 2.1.8 but this didn't work so I used 2.1.7.
Now this may be causing a dependency problem for LinqToObjectiveC 2.0.0.

The Mac is using chruby ruby-2.1.3 instead of system ruby. This may be causing a problem for Cocoapods to install ReactiveCocoa 2.1.8. I don't know.