An error occurred while installing scraperwiki (3.0.1) gem

Ran into this issue when running under ruby 2.3.x:

Injecting configuration and compiling…
e[1G-----> Ruby app detected
e[1G-----> Compiling Ruby
e[1G-----> Using Ruby version: ruby-2.3.1

e[1G NoMethodError: undefined method `spec’ for nil:NilClass
e[1G Installing unf_ext
e[1G Installing nokogiri
e[1G An error occurred while installing scraperwiki (3.0.1), and Bundler cannot
e[1G continue.
e[1G Make sure that `gem install scraperwiki -v ‘3.0.1’` succeeds before bundling.
e[1G !
e[1G ! Failed to install gems via Bundler.
e[1G !

The scraperwiki gem installs fine under the default ruby 2.0.0.

Bundler runs fine for ruby 2.3.x on my local environment.

Thanks, you’ve found a bug:

As you say, the workaround is to select an older version of Ruby for your scraper.