ruby-fakegem doesn't sutb all required attributes. To name one is a date. That generates warnings on gem loading. Here is a list of required spec attributes for rubygems 1.3.5: :rubygems_version, :specification_version, :name, :version, :date, :summary, :require_paths You can obtain the by running this in irb: require 'rubygems/specification' Gem::Specification.required_attributes Reproducible: Always Steps to Reproduce:
Starting with ruby-fakegem.eclass r1.27 we now try to install the upstream gemspec, and only use our generated version as a fallback.