MakeMakefile#xpopen

# File tmp/rubies/ruby-4.0.0/lib/mkmf.rb, line 457
def xpopen command, *mode, &block
  env, commands = expand_command(command)
  command = [env_quote(env), command].join(' ')
  Logging::open do
    case mode[0]
    when nil, Hash, /^r/
      puts "#{command} |"
    else
      puts "| #{command}"
    end
    IO.popen(env, commands, *mode, &block)
  end
end