# File lib/rubygems/installer.rb, line 534
    def ok_to_remove?(spec)
      return true if @force_ignore
      srcindex= Gem::SourceIndex.from_installed_gems
      deplist = Gem::DependencyList.from_source_index(srcindex)
      deplist.ok_to_remove?(spec.full_name) ||
        ask_if_ok(spec)
    end