class Gem::Ext::ConfigureBuilder

def self.build(extension, dest_path, results, args=[], lib_dir=nil, configure_dir=Dir.pwd,
  target_rbconfig=Gem.target_rbconfig)
  if target_rbconfig.path
    warn "--target-rbconfig is not yet supported for configure-based extensions. Ignoring"
  end
  unless File.exist?(File.join(configure_dir, "Makefile"))
    cmd = ["sh", "./configure", "--prefix=#{dest_path}", *args]
    run cmd, results, class_name, configure_dir
  end
  make dest_path, results, configure_dir, target_rbconfig: target_rbconfig
  results
end