class Gem::Commands::BuildCommand

def execute
  gemspec = get_one_gem_name
  unless File.exist? gemspec
    gemspec += '.gemspec' if File.exist? gemspec + '.gemspec'
  end
  if File.exist? gemspec then
    spec = Gem::Specification.load gemspec
    if spec then
      Gem::Package.build spec, options[:force]
    else
      alert_error "Error loading gemspec. Aborting."
      terminate_interaction 1
    end
  else
    alert_error "Gemspec file not found: #{gemspec}"
    terminate_interaction 1
  end
end