execute

# File lib/rubygems/commands/build_command.rb, line 55
  def execute
    gemspec = get_one_gem_name

    unless File.exist? gemspec
      gemspec += '.gemspec' if File.exist? gemspec + '.gemspec'
    end

    if File.exist? gemspec
      Dir.chdir(File.dirname(gemspec)) do
        spec = Gem::Specification.load File.basename(gemspec)

        if spec
          Gem::Package.build(
            spec,
            options[:force],
            options[:strict],
            options[:output]
          )
        else
          alert_error "Error loading gemspec. Aborting."
          terminate_interaction 1
        end
      end
    else
      alert_error "Gemspec file not found: #{gemspec}"
      terminate_interaction 1
    end
  end