I have tried the following procedure and it seems to work:
- edit Gemfile;
- run `(bundle command with --deployment somewhere) --no-deployment --path vendor/bundle`.

How about the following:
```
To download and install your omniauth gem run the [`bundle install` command for your setup](#install-gems). If necessary you can add the following options to the `bundle install` command to override Bundler's deployment mode: ` --no-deployment --path vendor/bundle`.
```
Looking back at your experience do you think that would have helped @tdm00?