class Gem::Ext::ConfigureBuilder

def self.build(extension, dest_path, results, args=[], lib_dir=nil, configure_dir=Dir.pwd)
  unless File.exist?(File.join(configure_dir, 'Makefile'))
    cmd = "sh ./configure --prefix=#{dest_path}"
    cmd << " #{args.join ' '}" unless args.empty?
    run cmd, results, class_name, configure_dir
  end
  make dest_path, results, configure_dir
  results
end