class Bundler::CLI::Gem

def validate_ext_name
  return unless gem_name.index("-")
  Bundler.ui.error "You have specified a gem name which does not conform to the \n" \
                   "naming guidelines for C extensions. For more information, \n" \
                   "see the 'Extension Naming' section at the following URL:\n" \
                   "https://guides.rubygems.org/gems-with-extensions/\n"
  exit 1
end