try_type

# File lib/mkmf.rb, line 1203
  def try_type(type, headers = nil, opt = "", &b)
    if try_compile(#{cpp_include(headers)}/*top*/typedef #{type} conftest_type;int conftestval[sizeof(conftest_type)?1:-1];, opt, &b)
      $defs.push(format("-DHAVE_TYPE_%s", type.tr_cpp))
      true
    else
      false
    end
  end